I think there was a very short run of those monster Mercs, 3.4 liter. You will burn fuel like a space shuttle, even for an old 2smoke. Same deal with the old thirsty v8 omc's.
You have to keep your spread skippin` and diving. Far from optimal. I burned 35 gals Sunday.
Nature of the old carbed motors. That`s a single 150.
The V8 was a beast. Monty Racing got sick numbers from that block.