I have a 69 340,X heads, stock hp exhaust manifolds air gap performer intake and comp cam pp284h cam 0.484 lift. 4 speed car with a 355 rear end. I have a holley carbureter 80778 700 cfm carb that needs rebuild. currently 69 jets in front and 78 in rear. 6.5 power valve can any one give some suggestions on jet size and power valve size? a local carb man said I should change the power valve to a 4.5 because of cam.
