Welcome to the forum! A few more details would be needed to provide any meaningful help. What rear gear ratio do you have? What size rear tires? What are the exact cam specs that came on the card with the cam?
Cam specs are 285/285 480/480. The Indy heads springs were rated up to .509 lift the intake and exhaust valves are 1.88/1.60 bowl ported and 63cc chambers.
The rear is factory 3.23 sure grip.