54 should have a 235. Way to tell is the lifter cover. If it stops at the head, it's a 235. If it goes over the spark plugs, it's a 216.
A word of warning on these engines. They are not made for continuous operation at high rpm. For highway driving, I consider 2,600 rpm to be tops. Problem is the rods don't like the abuse and will stretch.
My newer rims are 16X6.5, iirc. Setback (from back flange to drum face) is about 4.5", can't recall exactly. The problem comes with hitting the tie rod end.
