340 block with NO main caps

I've cleaned up worse. Most shops now line hone instead of bore. If you can find a competent shop, what they will do is bolt the caps on and position the hone to barely skim the block side, so as not to affect the crankshaft placement so you will not have to run a shorter timing chain. I always make that clear to the shop that's how I want one done and have never had an issue. They have always been accommodating.Good luck with it. If it turns out useable, you did pretty good!