Bonneville floor should accommodate the THM 400 with no issues. I would use the long tail. Leave the cross member where it is and just extend the mount porch.
If you can do what Ron did and find a 64 Cadillac Deville, Eldorado or Fleetwood pan, it will solve the filler tube issue. Or weld where the filler tube goes into the Roto pan to the 400 pan.
You may need to use the 2321 transmission mount.
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The difference between inlaws and outlaws? Outlaws are wanted
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