firebird formula rear end help needed

[moparman]

thanks guys that was my biggest problem so far with the car hopefully soon ill get started on a motor the stock lt1 is just not enough trying to find a 12 bolt to put it in im thinking of going with a 30x9 slicks on the car i just have the 245/50/16s on it now im going to start a buildup on the car while im at school we started a drag racing team down here so hopefully i can incorporate the school alittle on the car too make some use out of the chassis dyno and the flow bench etc. anyone have any ideas for good aftermarket suspension? im looking at the umi tube k frame and control arms. also any of you chassis guys what would be better to buy some bolt/weld in subframe connectors or cut some room in the floors and weld in 2x3 tube there is alittle bit of rust in the rear foot area and the driver floor but the car is a hardtop so the damage isnt too extensive