Alright so I put 4qts 10w40 and 1qt 20w50, then my zinc additive which was surprizingly thick.
Cold idle neutral: 50psi, in gear 45psi
Hot idle neutral 10psi, in gear 6psi
Crusing at 50mph 23-26psi.
Not too bad. Obviously there is something wrong but at least I can drive it without worry now.
I'm thinking in the near future I will pull the engine and trans and sell them. Ive wanted to do an ls swap for a while plus I have a 4speed muncie that I'm dying to put in.