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What is the best repair manual for my 1988 270 with mercruiser 5.7 and outdrives?Where would i find them?

Hello,just got a 88 270 project boat that doesnt run.Twin 5.7 260 h.p. motors.Boat fits in here better than anywhere else.Lots of good info here.If anybody has any info they think i should know i would like to hear it.At cruising speed with these motors what kinda fuel economy should i get,1...