Yep,If your swapping from a 6 to a V8 you need conversion mounts unless you have a v8 parts car. I would also upgrade the 9" brakes and axle too. That 7 1/4 won't last long
Already went to 10" on front. Been looking for 8 1/4 or 8 3/4 rear end they are expensive even if you can if an a-body one.
I guess if that 7 1/4 goes I will deal with it then.