Machine 360 crank to fit in a 340 main block

Rocket, we did that to a friends '70 Duster a few years back. Had the stock 360 cast crank turned down to 340 specs . We didn't have it hardened or anything like that we just droped it in and went racing. This was a bracket racer. We ran that engine in that car for 6 or 7 years never a problem. Car went 10.20's-10.30's @ 128-129 range. Can't speak for others..but we didn't have any issues with ours and it cost less than $100. bucks to have it turned. Good luck with it.

Terry