Trouble getting a slant six in the car

Alright I’ll give it a shot. Don’t suppose I have anything to lose at this point. Someone else on here has me wondering if I’m going to have issues getting my 77 motor paired to my 74 trans. Is this a problem or do I need to put the other trans (the one that came with the motor) in there?
Does this mean you don't want the leveler I'm offering?