we had a stock 2 bolt main 400 block and put the splayed caps and bored / stroked it out to 434 cubes. Block half filled...
It ran 9.60's in a 3100 pound car for 4 seasons (about 800-900 passes)
All we did was freshen it with new rings and bearings every winter. After we ran it we sold it and the guy is still running it now onto his 3rd season.
This is shifting at 6800 and going through just under 7000.
I would build another one in a heartbeat, but there must be a difference in my drag cars from the roundy rounders.