Well,you got it-it's a 350-350 and 58 olds 411 rear.
When he was building the car a friend of mine had a 340 4spd for sale but my brothers car buddys convinced him that the Mopar would interfear with the steering box,oh you can get Chevy parts anywhere blah blah blah.
After 25 years and still having to fight with the steering box/exhaust clearance and the disaproving comments of true Mope Heads he still regrets listening to his long gone "buddys".
To bad but still a cool ride.