[Bigshrimpin]

The 2.7L omc's aren't too bad on fuel stock. 86 and 87 have many desirable features the big bore carbs, 2.7L heads and the bridgeport exhaust. If you bore the 2.7L out to 3.685 and add finger ports, use stock 1993 - newer pistons you have a beast. Bump up the compression, modify the rod slots and swap the intake you have 300+ hp motor without losing any bottom end.

My current powerhead is a stock 1979 v200 vertical reed merc, but I have a monster in the works.