I had one in my ‘64 Tempest. You move the crossmember back a full 6” and drill new holes.
I was using the factory rubber insulators, the depression in the frame rail where they originally sat caused the insulators to sit not quite flat in their new position but everything worked fine.
If you just want to bolt it to the frame without the rubber insulators you can just drill the ends of the crossmember and corresponding holes in the frame. My ‘64 GTO bracket car also had a short tail TH400 (with a transbrake) that used this method to mount the crossmember.
Both ways work fine.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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