20psi stock 5.9 carnage

Like me looking for 225 cores. I have like 6 170s but I am somewhat 225 poor. I guess slant sixes are enjoying a resurgence, because even the crap ones I find are 350 bucks. Locked up piles of rust. People used to give them away.....and there SURE won't be any of those ever made again.
225 a bigger bore or stroke or both?