Most of the GM trans will fit on the back of the 292. It is the same bolt pattern as the SBC. Are you going to use an Automatic or Standard Shift ? Looking for overdrive as well? My 292 has a 5 speed from a Camaro behind it and it works real nice.

Ontario Inliners
1965 Chevelle
1940 Chev
1965 Chev Pick-up
1970 MGB Roadster