47-55.1 TH400 transmission cross member / bracket vs TH350 for a Camaro subframe

[Gregski]

Hi All I have this question posted in my '54 build thread but it may get better attention here

I ordered this first gen Camaro TH400 transmission cross member like an idiot, not thinking who would cut up a first gen for a frame swap, so I recon my front end is off a second gen Camaro

anywho, I believe the TH400 is like 3" longer than the TH350 cause the bracket that showed up wants to sit about 3" forward of where it needs to bolt up to the transmission tail housing

so what cross member do you recommend for the TH400 if I don't want to put any more holes in the frame (if possible)