I like 360s. When building a stroker, the 360 will have a larger main bearing and higher bearing speeds [bad], but it will have more crankpin overlap [good]. This is true for standard stroke engines as well. IMO the main bearing speed isn't a big deal for drag racers and street cars as the rpm isn't up there for any length of time. When building a stock stroke engine the 340 will have a heavier piston than the 360 when using the same make and style of piston. I think the heavier piston is more of a detriment to rpm than the longer stroke of the 360 is. A lot of 360s are raced with external balance, I just happen to think internal balance is worth the cost of the mallory. On a stock stroke engine the 360 needs good heads even more than the 340 to perform up to it's potential. You have 20 more cubes to feed and less time [ higher piston speed ] to do it. Equally built a 340 will make slightly more power per cube, but the 360 will flat out muscle the 340.