340 Block Cost

Well, then buy it for you if you want. You now have instructions on how to save it. Use the 340 for the stroker. Seriously, what are your chances of ever finding the car it came out of? That would be the only reason in my mind to not use it for a stroker. The 340 block is arguable thicker than a 360 so it's stronger. No reason in the world not to use it and then you have an engine that you'll like on a lot of levels.

where is the 340 thicker and stronger?

If so, at what power levels will that be significant?

My understanding was the 0.020” increased bore radius slightly un-shrouds the valves more for slightly increased head flow. I’d think this may be pretty minor on street engine with 2.02 valves.