My son and I are replacing his 67 Mustang 6cyl 3 spd with a 75' 351W and a 92' T5. We have a flywheel with a cast# C6AE-63 C and a stamped D7TE-HA. From what I can find out this is a 77 truck with a 302? It has NO counter weight on the back. If all of the early fords are 28 oz will this flywheel work?