4spd swap checklist for a 68 Dart GT 318/904

I did..I bought it from Venom Classics in Mesa, AZ. I took the plunge since finding one locally wasn’t really an option. Shipping was reasonable and the trans came out of a rotisserie restored 71 Swinger. Their customer wanted to put an automatic in it. My 904 needs a rebuild so, rather than spending the money to rebuild that and the headache of pulling it for the rebuild.. I’d pull it and replace it with a 4spd. It was my plan anyhow when buying the car.. I’m just doing it first than other stuff first. I was gonna do brakes and rear axle upgrade. I’m still gonna do those things, just the order of which I do them was changed up.

I wanna say that the 5.9 was available maybe in a 3/4 ton with a 5spd? I’m not 100%. That’s the era that used the roller bearing that goes in the crank register. So long as the hole is deep enough for the input shaft, it’ll work.
Thanks for the info!