My carb is still being rich...68 jets in front 72 in back 4.5 pv with 8-9psi of vac... I was told the throttle plate might be warped... I can buy a used 770 cfm street avenger should I get it? or what carb would be better for my 360 with 10.7 compression .524 lift and magnum heads. with a 4.10 gear