[Bobboloo]

I know that the 73' T (MFI) cars had iron cylinders but I don't know if the 73.5' T (CIS) cars had the iron cylinders also. If they did then it would be safe to assume that your car has had the cylinders replaced if there is no rust evident on them.

That particular case (2.4 7R) is the best to build on for a mag case in my opinion.
1. It's a 7R the most reinforced and
2. It's a 2.4T the least stressed of the 7R case motors.