Greg,
I'm sure you are aware the 292 is the same as a sbc or bbc when it comes to bellhousings. Gm used an NV4500 on their trucks in the 90s, so there are bellhousings that will bolt up to both the 292 and the gm NV4500.
The 1955 and later v8 bellhousings, will bolt up to your 292, but you will need to modify the crossmember to accept the angled mounts. 1940 bellhousings have provisions to mount the clutch and brake pedals, 1955 and later bellhousings do not.
When gm used the NV4500 in there trucks, the bellhousing did not bolt to a crossmember. The motor used 2 front side mounts, and 1 tail support on the transmission. The side mounts should not be a problem to fabricate, but losing the bellhousing crossmember may give you some problems in your 1940.
I would consider using a stovebolt to th350 adapter turned around to bolt the 292 to the 1940 stovebolt bellhousing. You would likely have to make your own adapter to run the nv4500 behind the stovebolt bellhousing. I made an adapter for my 1940, but still haven't gotten around to working on that truck. I can send pics on request. By the way, thanks for the brake pedal stuff from that 1.5 ton gmc
John
