I believe the slant 6 is a little longer then the original flathead was, and the firewall was inset to accommodate the flathead's length. Likely the slant 6 won't fit into the recess for the flathead because of the angle, but none of that may matter at all. We have no idea what was done to put the LT1 in the car. In addition, I have no idea how the length of the slant 6 compares to the length of the LT1, they may be the same length, but odds are better the slant 6 is longer then the V8.I would guess it depends on if or how much the 37's firewall has been modified to fit in the Chevy V8.

That probably wasn't very helpful was it....Gene