Have you run it before? If so what are the numbers?
Does it feel like its missing?
What type of fuel are you running?
Was the weather a factor, I.E> HOT and HUMID
Is it spinning? Maybe you need slicks.
Are you getting full wot? With the engine off, have someone push accerator pedal to the floor and then you can check to see if your carb is at WOT.
Your heads are pretty big for that bumpstick, alittle more agressive cam profile and a open plane intake like a Victor Jr would really wake that thing up.
Goodlcuk,
Cp