The do work with in early A body with a 340, our car does not have power steering, the headers are not close to the box, and you can just use a starter from a 93 Dakota, but i am not sure on the power brakes, that could be a tight or no fit.
I just worked on adjusting the motor with a shim on passenger side, and i also elongated the frame, for more adjustment, and they are so close but after it all settled, no hammer needed.
If you run the TTI's and a 904 you just need to use the mini mopar starter that came in later model trucks and van's, and the TTI's will give you plenty of clearance.