[trikmit]

I have a 69 stang coupe witha 351w .30 over edlebrock cam gt 40 heads holley street avenger 670 carb hooker headers and a c4 trans does anyone know about how much hp this should be putting out and what gearing should I use for the rear end I was thinking 3.55??

[The Greek]

You don't give much info for a HP estimate, so I'm not going to even try. I wouldn't go any lower (Higher Numerically) than a 3.55 gear since there isn't an overdrive gear. This is a good gear ratio for stoplight to stoplight driving, but if you plan on a lot of highway driving, this is going to place the engine RPM at about 3000 RPM at 65-70 MPH.