3.55 or 3.73

[Ron Fox]

It's been awhile since I have been on PT and longer since I have posted. I am not the builder of my car and the car has been pushed aside for awhile now. It's time for some forward progress. I know what my builder wants but would like to get everyone's opinion about a rear gear. Have a 1969 Firebird. Will be a street car and would be fun to take it to the nearest road track a time or two (Bowling Green). Will have a Ford 9 inch (DSE), 31 spline, 335/30/18, T56 Magnum and probably 600+hp. I know there are several calculation sights out there to help me with a set up but wanted to hear from all of you. 3.55 or 3.73? Please educate me.

Thank you for your time.

Ron