Need some help figuring CR

Glad to hear your back. What's it going in ?
I dont have anything to put either of these engines in lol! I'm just building em..ive got my eye on a couple of Dusters and a B body tho. I guess I'm just bored. Figured I'd approach this differently this time around.
Before I would have a car and work on whatever it came with, now I'm building the drive train first, honestly idk what I'm doing