Well its not your average small block, 4 bolt main steel crank,6 inch rods 10.5 to 1 Keith Black pistons,balanced,line honed ,decked,comp cams (can't remember the specs) The heads are off a 70 350 1.94 ,s but heavily ported,screw in studs,guide plates,Manley valves,I still have to get the roller rockers,Intake ,carb. I went with a small block simply because I live in a rural area, and gas,well big blocks don't usually sip....