I'm pretty sure that adapting a Sprint head to a 292 (or other common Gen-3 block) is going to be rough going.
The other way (modify the 292 crank to get an acceptable rod length) is much easier, but not as large. The Sprint deck height is IIRC 9.15 like the Chevy. Using even a 5.7" rod (not enough for this stroke) the 4.12" arm means the piston is only 1.39" compression distance (for zero deck) and the piston for a 6" rod is an ashtray at 1.09". Dropping the stroke to 2.0" journal takes off about .095" (the pin difference, less .005" for clean-up).
What I don't know is, how far off are the head bolts, water, etc. between Sprint and Chevy?
Do you see where I'm going...
