just wondering if the water pumps in the outdrives is enough to cool these high perf. motors and als the timeing is good at idle but when I rev up its jumping all over also when I shake the thunderbolt modual that comes out of the distributer it jumps in guessing its bad what do you guys think??? thanks for any help I have fixed the timeing problem it was the module Im still realy wondering about the water pump ??????

I too have a blown SBC and I run a raw water cooled engine off the pick up off the drive thru the water pump for the engine and a separate transom mounted pick up that force feeds my intercooler thur a sand/sea strainer. Thus far after about 18 hrs of use works well. I see about water pressure in the low 20's at wot on the engine and around mid to hi 20's on the intercooler, can't speak for the timing/ignition issue.

Water pump in outdrive?????? Are you talking about Alpha drives??? They will bring in enough water, but they are not going handle the HP/torque of the engine in the pic.

The module has to be grounded through the case also, so shaking it may be creating a short.