Seem to be struggling with top speed on my 85 Comp. Engine runs smooth and gets on plain without issues, but seems to top out around 35 mph. It will run at that speed at 3/4 throttle without an issue but when I go WOT you can hear the motor want to spin up faster but it seems to just "stall" and never gets past 35.

Going to check timing tomorrow and check engine speed on the lake but, any thoughts on what else could cause this? If I were to describe it, it doesn't sputter or buck as ifnit had too much fuel but seems like it is gasping. Aka, sounds like the throttle blades go WOT but engine won't speed up any faster.

It has an original 13 x 12 prop that was recent refinished. Stock Holley carb w/ vacuum secondary.

Any thoughts?