I built a 170 for the 64 Barracuda in the 70's when gas was too poor to run the 273. I was inspired by the "Baby Grand Nationals?" where the Mopar 170s came in first for as many as were entered. They never ran again since Chevy and Ford could not compete. A real sweet motor, not stock.
Chevy 235 which was in the vette, I find it hard to believe that gm would back down from the mopar 170 slant 6. The/6's can't be spun very tight due to their long stroke/ long rod design and the crankshaft only being supported by 4 main bearings