Slight surge at top end

Sorry in advance I have very little experience with mechanical work altho I do under stand the basics and can do some trouble shooting. This is also the first inboard boat I have ever been in let alone owned. And it have never quite ran right story of my life

I will check the ignition brand when I get off work today and re write a more detailed post

What is the total timing at WOT RPM?

I am not sure how a QF carb works, but you could have someone observe secondary throttle plate link to see if it varies with the surge.

Obviously leave doghouse at home . . .

Back story: I bought a 1990 Ski Nautique 351w about two years ago which had sat for two years prior me purchasing. After buying it we replaced the plugs and had a compression test done ( which came back fine) and timing set. the boat ran good for a few trips out then started to pop in the carb and hesitate on take off. Sent the carb out to be rebuilt put it back on and still had hesitation and couldn’t pull a skier with out stalling. So frustrated I ordered a new quick fuel carb to replace the holly . After the carb swap boat ran good for about 2.5 hours then cut out and wouldn’t restart. Dropped it off at the marina with a box of new electrical tune up items I ordered ( rotor, distributor cap, plug wires,coil, fuel water separator) found out the gear on the distributor sheared off. Got a new distributor installed ( he also put all the other parts I had on. Took the boat out to test run it and I noticed at 3/4-7/8 throttle it runs great anything above that I get no extra rpm, power, or speed but the boat will slightly surge like it wants to keep going. Any ideas I thought fuel/air mixture screws or fuel pump air leak/ fuel or air restriction any suggestions of where to start? Thank you in advanced and happy fathers day to any dads out there