I've got versions of the car and a very similar track, currently receiving revisions.
So I thunk it's a 57 Chev so I put in the biggest engine Chev made in that period, but than I noticed it ran slicks so it must've came from a lot later than '57 and just uses the body.
So I widened the track and stuck those wheels outside the guards like a good modified should, also explains how this car can have an independent rear end.
Beveled the mirror and air cleaner so it's not such an eyesore, reversed some text and replaced the tacho. And the collider is as forgiving as I could make it.