Okay so I own a 1978 Pontiac Grand Prix and it’s a roller. Car was originally a V6 with a th200 or whatever came with the V6. I have a chevy 350 and also a th350 that I’m going to throw into the car, and I was wondering how much modification it will take to install the th350? Can I use the stock transmission’s crossmember? Do I have to buy an aftermarket crossmember? Any help would be greatly appreciated.