Benny- Sorry to burst your bubble, but your way of adding up HP just doesnt compute in the real world. You probably have about 290-300fwhp to be correct. If I added up like you did I would have 450hp probably... Which cirtainly isnt the case. Only way your gonna know is get to the track. I think the 3.70 gear would be good for you.
The M6 Ls1's are a ***** to launch. Get the gears, and leave hard. He will be trying to make up and probably won't be able to launch it worth crap. Ive raced several of these on the street and they can't hook. Just hope he doesnt blow by you in 3rd gear.
Sky
------------------
-1989 Saleen Mustang #406- TFS Heads, E-303, edelbrock intake,70MM TB, 73mm MAF, off road H, headers and 3chamber flows.
12.55@107mph
Runs on 87 Octane and gets 24mpg!