Plate if you want to relocate the engine, or lose the stock K-frame or torsion bars. I would put a mid plate in it if I used a front plate. Limiters too. Easy to get the trans in or out.

Buddy of mine has a big block stick car, 33-3400# maybe. Will go mid to low 9s with low 1.30 60s. Can go into the 1,20s if he gets after it. Solid steel mounts in the stock location.

If the results don't match the theory, change the theory.