Pulled the 6

[roofing458]

yanked out the 6 cyl yesterday 3921970 .. & .Tranny gm 3837334.I know there is some posts somewhere on the swaps & i posted a few .I going to put a 350 mexican american 1006636 crate motor in it .i just need some parts numbers for new motors mounts ?What would be the better trans The 3837334 or should i upgrade to a sm465 ?Also trans mount parts number ? What if any would the upgrade make on performance .Not looking to go fast i already have something that runs fast ...Chime in