Fly fish carburetors

Yes, awesome service.
They are my go-to carb guys.
I’ll never touch a carb again..
 
I just bought one. Ordered it very early in the morning on 7/10 (Friday). Called them on Tuesday as I hadn't been billed yet and they said they were backed up and hoped to get it shipped by the end of the week. Got it this past Monday afternoon. Very nicely boxed. Carb looked good. Bolted it on Monday night and boat fired right up. Made a few minor adjustments to the idle mixture and idle speed. Sounds good so far but haven't went out for a cruise yet. I think price was very good. The carbs actually come from Guaranteed Carburetors. Carb was very clean with fresh paint. So far I would say go ahead but don't expect it as early as the site says.
 
IMHO: Look around for an old school rebuilder in your area that tests and adjusts the carbs before giving them back to you and have them rebuild yours rather than do an exchange. That will probably cost you the same, be quicker, and if there is a problem you can bring it right back to them.

I bought two carbs on the Internet from a Florida rebuilder about a dozen years ago.
Both carbs on my old boat were original and one was giving me trouble so I decided to replace both at the same time.
One carb I got from them was perfect, the other wasn’t. They took the defective one back and replaced it, but waiting for it to arrive was a PIA. So much for them testing before they go out the door......
Neither carb I got from them was a true marine carb.
Both were automotive carbs that were modified for marine use.
I had been using a local rebuilder for many years before that and went back to using that local rebuilder again afterwards.
That rebuilder gave me an education about the difference between a true marine carb and an automotive carb modified for marine use. The modified carb is safe to use, and are quite common because real marine carbs are relatively rare. That makes it hard for rebuilders to keep a stock of cores.
The local rebuilder also tests and adjusts the carbs he rebuilds on a running engine.

Another option for your big block may be a new carb:
We installed a brand new Edelbrock 1410 (750 CFM) on a friends big block powered boat a couple of years ago and it ran flawlessly.
His old carb core wasn’t rebuildable.
His motor had a spread bore manifold (for Quadrajet), so we used an inexpensive adapter plate to accommodate the square bore Edelbrock carb.
The bonus was that he originally had a mechanical choke and the Edelbrock Carb came equipped with an electric choke so adding a short wire to the positive terminal on the coil (Keyed 12 volt power) gave him an electric choke too.
When I repowered my old boat with brand new carb to pan motors from Mercruiser back in 2012, the new 5.7’s came with Edelbrock 1409 (600 CFM) electric choke carbs on them from the factory so Mercruiser must really like them too.
 
I have rebuilt many carbs and modified many of them for performance reasons. The problem with mine was it had sat for 3 years with ethanol in it and had gritty sand looking stuff all through it. I cleaned and and used a scotch brite pad in the float bowl but I wasn't convinced there wasn't still some of that in the idle passages so figured a rebuilt one from a shop that 'hopefully' had a better method of cleaning them than I did or hopefully get one that was never as bad as mine.
 
I’ve had great luck with FF Carbs in the past but replaced my Q-Jets with Edelbrocks a couple of years ago and they’re great.

I might not have gone that route but they were new in the boxes in a cupboard when I bought the boat so WTF?
 
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