[Bradleyrj]

I am thinking about going to an auto in my car. ..

1990 GT, 347, TFS TW Heads, TFS Cam, TFS Track heat, Twin turbo set up using twin Grand national turbos' Front mount, T5Z, 3.73 gears (now but installing 3.27's)

Lets assume even with good shifting...I ran a 10.75...@ 130 ish.. how much could it pick up by going to a C4, 4000 stall, brake...something that will handle the power but be a little easier on the car compared to the T5?

I havent made a pass with this turbo set up yet.. but I would guess 500-550 rwhp is gonna be pretty easy but also the limit since im on the stock block. I want to go as fast as possible but this motor needs to live a few years cause I cant afford a dart block right now.