I have a 4-bolt main SBC 400 block with caps and a few cranks to choose from for same. I have two stock cranks and I believe a cast steel scat crank for 5.7 rods, ext balance. The block was sonic tested and the lifter valley is deburred but no other machine work was done. The bores are still 4.125. I'd guarantee the block has a clean bill of health from that standpoint. Probably would need the typical 0.030 over though. The stock cranks are std/std as best I can remember, I could check them if you were interested. The Scat crank is new in the box. I don't have any heads/intakes/carbs/tins to go with though.
That truck would scream with a well built 406 lurking under the hood. Done right I'm sure it could beat a certain Blown S10 and that gorgeous 66 Nova. Now it might struggle against the new mazda powered Escort!!
If any of that sounds interesting PM me, we'll figure something out.