It just bogs down

I have a Correct Craft Barracuda with a Chrysler m318 235hp. I have a problem with the engine under load. When I am at the house (with the fake a lake connected), the engine fires up and runs good. I am able to rev it up with no problems. When I am at the lake and put it in gear under load (with the prop in the water) the engine will not pull over 2000 rpm. It just bogs down. A have rebuilt the carb. Any suggestions would be helpful.

Any black smoke when it bogs down? The float might be too high. Do you set the boat level with the fake a lake like it sits in the water? Does it rev fine in neutral in the water? When my mustang bogs under a load it's usually the power valve or the accelerator pump. Both can get a slight tear and cause flooding. If you have a holley, a slight backfire or hiccup can pop the power valve.

Check the ignition system first then look at fuel delivery next. So first visually inspect point's for pitting, check condenser for corrosion, the rotor and cap for heat marks and arcing replace as needed. Now check the dwell, then the base timing , then timing at 3000 rpm. now check the coil leads for corrosion and hot spots, inspect spark plug wires and look for signs of arcing replace as needed. If all that checks out then look into the fuel system, check fuel/water seperator,fuel filter, fuel pressure, then the float/carb last. Just because it revs fine on land or neutral on the lake means nothing there is no load to the coil or condenser until you put it in gear and go.

Definetly sounds like a timing related issue. However I am not familiar with that particular engine I am going to assume it has a vaccum advance distributor on it. If so disconnect the vaccum line pull the cap off the dist. and suck on the vaccum line and see if you are actuating the advance. It sounds like you are not getting a timing advance to me but then again it could obviously be inital and full advance timing or simply fuel delivery.

Ya if it does have a vacuum advance then someone has put an automotive distributor instead of a marine dist. I laugh everytime someone on this site talks about a vacuum advanced distributor.