Thanks for the advice, Ill do some tweeking on it once it starts :/

If I just leave in the shocks for now, should I drop them as much as I can, to almost flat, or is that hard on them? For tire pressure Ill try dropping it a few lbs.

 

try it both ways. im going to say try the tires with low pressure and the shocks pumped first then try it with the air out of the shocks. it should launch better with the shocks not pumped up all the way. also dont flash the convertor stall it up a little and practice peddling it out of the hole. thats the down fall to having a motor that produces torque in a car that doesnt have any suspension work. its like an ls4 car you gotta try, and spin as little as possible and try to play catch up. the upside is the 383 should rev pretty good, and the weight transfer is going to the drive wheels. get the pressure down into the 20s and practice practice practice. when you get a chance pony up the 20 bucks and buy the butt cheap gas ryder shocks, and ditch the air shocks. ive never had a good experience with air shocks usually people run them when there backspacing is wrong or there springs are shot. on a gbody 3.5" with 275/60/15 will fit with no rub of any kind. 3.75 looks better and gives you some more quarter panel room, but weld doesnt make them like that. crager does, but with a real torque monster you run the chance of twisting the wheels up.

 

Ill keep practicing and see where I can get with my set up now. I took me a while to figure out how to launch my 6th gen too. But that car catches up better then this one haha.
I'm already running 275 60 15s on my cragers, so I have a good offset and size now, its just the missmatched not high performance tires are killing me lol.

 

understandable. radials are nice just be careful coming off the convertor with a sticky set of radials. id be afraid itll really hook and break the carrier, axles, or a u joint. on a street tire it should hook up reasonably i never really read up on what trans your running. is it a 3spd or a 4spd?

 

darn i got beat to it lol. i was gonna say softer springs in back to let the car transfer more weight to the rear wheels. this equals less spinning lol.

 

Well its only a 10 bolt, and I think it could use a fluid change, so it could break haha.

And the tranny is a 3 speed. I let air out of the shocks and it didn't get softer at all. I'm pretty sure the air only gauges the height.

 

Those 555r are an amazing tire, should do you good ive got a set on the goat & looks like everyone else has ya goin in the right direction