Hello all, already made a post in the new member section. Been a lurker on here for a while and over the last couple years I’ve been tinkering with a car my dad gave me and I’m hoping to have it going come spring. It started as a project with my dad brother and I back in the late 90’s when I was 12 or 13 (36 now). At that age I obviously didn’t have the slightest clue about anything, I just enjoyed going cruising/racing in it. It’s a 1979 Malibu wagon with a factory 4 speed. Bench seat car, radio delete from the factory, crank windows, power steering (deleted by us) and it had heat and air which is gone also. We did the normal run of the mill 350 and he put an after market clutch in it. Not much later a 9 inch ford rearend with 4.56 gears. The gear changed caused us to open the motor back up, put a bigger solid lifter cam in, a different intake (victor jr.) and Holley 650 carb and they car sat after that. The tags that are on it expired in 2003…. Over the years my dad lost interest and moved on to other cars. The car ran fine when he got it all stock and paid a friend $100 cash for it. He said since I’m the only one that still likes it that he’s transferring the title into my name. Sorry about the long post but here’s where my questions come in. Couple of years back I got it out of his garage and cleaned it up. Putted around close to home and decided I just want it to be more of a cruiser so I replaced the 4.56 gear with a 3.89 and bought new wheels and tires for it. The rear tires are 26x9 Mickey Thompson et streets. From reading I’m worried about the stock Saginaw transmission holding up with sticky-ish tires if I do take it out to the track just to see what it’ll run one of these days. A family friend gave me a Muncie 4 speed (m20 I believe) and a t10 incase the Saginaw ever failed. would either of these transmissions be a direct bolt in or would any crossmembers have to be modified and a new hole cut in the floor of the car? Again, sorry about the long post and thank you all for your time!