Car-Part.com--Used Auto Parts Market
That is listings for junk yards in your area,just plug in your zip code.96 to 2000 truck 350's is the engine of choice.There are tons of them out there for a good bare block.The old tech was OEM 4 bolt blocks had a cracking problem on the outside bolts,but that has been resolved yrs ago.
All the yrs we have run 9.90 in 2350lb car each being hit hard with a tranny brake,there hasn't been a overwhelming number of engines we used aftermarket main caps.Do you need splayed caps??. I don't think so.