Mine did the same thing. Ceaning the carb was a huge difference, as well as updating to the new thread on water seperator. I finally put a different cam and heads on it and went to a 13X12.5 3 blade and could pull 44. Also, where you have the wakeplate set can affect up to a mile per hour. Since then I have done some more upgrades and can get over 50 at 4800. If you have any questions et me know.
Jason
87 comp
87 comp
Rousch Racing Heads
Howards Cam
Headers w/ 4" Exhaust
Dual plane intake
Holley 750 4bbl
Borg Warner 1.5:1
412 hp