Engine surge above 3k rpm and sometimes at no wake speed

[Stevo1989]

Quick back story bought a 1990 Ski Nautique 351w in 2016 prior to me buying it it had a protec EI put in was ran some and then sat 2 Year’s (due to previous owners passing away) after I bought it we discovered that it was not running on all cylinders. After changing the plugs and having a compression test done(everything was ok) and the timing set. Took the boat out shortly after that and experienced a poping In the carb and hesitation or stall on launch. Sent the carb out and had it rebuilt. Fixed the problem with popping but not the launch issue. So I decided to get a new carb and switched from the 600cfm holly to a 600cfm quick fuel. Upon doing so the fuel line did not line up so I had to change to a slight longer flex line. Took the boat out again and it ran beautiful for about 2.5 hrs then when cruising upstream the engine just cut out ( like someone shut the key off). So I took it and dropped it off at the marina to see what the issue was . Turns out the gear on the bottem of the distributor sheared off. So I got a new distributor installed and he also decided to use the electrical tune up that I had already bought previously just to have on hand ( coil, rotor, distributor cap, plug wires, fuel water seperator) and it was re timed. Took the boat out yesterday to test and see if this distributor was going to shear off. (It didn’t) the idle is set right around 900rpm when at very low speed it seemed to surge slightly then ran great in mid range up to 3000rpm cruising. Once I try to go any faster / beyond 3/4-7/8 throttle I get nothing no rpm increase no speed no power however the boat surges ( I think that’s the word to describe it ) and feels like it wants to give more but can’t. The carb is still factory set idk if fuel/air screws could effect only the low and high end. Or if it was something more like and air leak, fuel pump /filter/ line issue or something I’m not thinking of any feed back is greatly appreciated and thank you all in advance. (Also happy Father’s Day to any dads out there )