I used a Novak adapter behind my Turbo 400. Keep in mind you WILL lose a good bit of driveshaft lenght(you'll need a new shaft, or have yours cut down) with the Turbo 400 and the adapter.
If you need a measurement let me know, I'll put a tape between the rear of the block and the T-case(for the lenght of the Turbo 400 with the adapter).
You will also need to fab a spacer to go between the adapter and the cross member, I think mine was about 2 1/4" tall.
Why not swap a 727 from a 80's full size to back the 304, then the 300 is a bolt in. The 727 is a better tranny IMHO. Maybe because I have a Scout and if the 727 can stand up to my Pig, ~5,000lbs loaded it should hold pushing a jeep around.
if you do go the 727 route..dont forget to get the kickdown linkage.. we can pick up 727's around here for $200 all day long..
overall it will be shorter than the th400... so you still might need driveshaft shortening and lengthening..
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