Not a racer but asking a cam question.

Tire diameter is going to be 25.5" dia. 255 60R15. Remember "appear" stock. 15x7 steelies body color with blackwalls and dog dish caps. May concider 15x8 custom made steelies with just the right offset on the rear to fit the stock wheel wells. I believe the passon 5 speed OD is .7 overdriven like the A833 OD is but gives an extra gear and a closer more evenly spaced ratio between all 5 gears. The A833 OD by contrast is essentially 1,2,4,OD for lack of a better discription.