Originally Posted by jtybt
I work on boats so this may not apply.
What power valve do you have(in/hg)? The higher the #, the earlier it will open. Normal street operation for economy would probably have a 5.5. Try a 6.5 to 7.5 or higher PV and lighter spring. Matching power valve to secondary opening should give you a kick in the pants.
Here's the read out from the PDF on the Carb
Prim Jet 78...../Sec Jet 82/ /Pump Discharge Nozzle .040/ Primary Power Valve ..45/ Secondary Power Valve 35 / Stock Spring ..Pink/ Now has the lightest one in the Vacuum dia White.