What would you have to do to use 343 pistons in an AMC 360 if you can?

The 343 is a GEN-2 AMC V-8, the 360 a GEN-3. The difference in the block is a 0.16" deck height and corresponding stroke increase. The 360 uses a longer rod, and also a different piston pin height than the 343. I don't recall the difference in piston pin height (center of pin to top of the piston), but that is different as well. The 343 used 10:1 compression and a flat top piston with valve reliefs. GEN-1 heads have a smaller combustion chamber than MOST GEN-2 engines, the exception being 1970 through mid 1971 GEN-2 heads. These have the castin number ending with "291C" and beginning with "319". Compression will be less than 10:1 with the flat-top pistons even with the small chambers due to the 343 pistons lower pin height, but will be more than the stock 8:1 compression. The same is true even with big chamber mid 70-91 GEN-3 heads. The 343 pistons will mount on the 360 rods, just check pin height and valve clearance. Once pin height is measured compression can be determined. It should be around 9-9.5:1 depending on heads used. Frank Swygert Publisher, "American Independent Magazine" (for AMC/Rambler vehicles) http://farna.home.att.net/AIM.html