you do not need an adapter behind a 292 to a T5. it should bolt directly to your newer style bellhousing (any V8 one) w/ the larger hole.
a 292 has two offset mid / side motor mounts and if those are strong enough and made short, offer great support. the T5 has a rear stock S-10 rubber mount and those three should work. the later (larger hole) bellhousing centers the tranny & bolts directly to the T5 in my case. the T5 holes must be re-drilled to 1/2'' holes. I use grade 8 bolts everywhere. the sm420 has a smaller tranny hole.
http://s67.photobucket.com/albums/h298/1951otter/?action=view&current=DSC00367.jpg
http://s67.photobucket.com/albums/h298/1951otter/?action=view&current=579990-R1-016-6A.jpg
w/ this being said I do not know 40's trucks and frames. this may be what the doctor ordered ????? headscratch

Last edited by carolines truck; 03/15/2008 4:51 AM.
Jim & Caroline
The highway is for gamblers, better use your good sense."
Gooday-that's my 1¢ answer due to the lousy economy ~ cause I ain't got - no . mo . doe
Every Shaver | Now Can Snore | Six More Minutes | Than Before ... | Half A Pound for Half a Dollar | Spread On Thin | Above the Collar || BURMA-SHAVE