340 or 360

Well, maybe when they were built back in the day. But today, pretty much ANY block you get will require some kind of machine work (unless you happen across a NEW 340 block rthat was never assembled). As a result, this short coming can be overcome.

Trust me, I'm not dissin' the 340, my Dad and I had a Swinger 340. Ordered specificly for street racing - 727, 8.75" 3.91 Suregrip, bucket seat, but comlun shift because the guy felt the car would be lighter without a console. I don't really know it that's the case though.