Likely 383 swap-parts advice requested

I totally understand. I kick myself in the *** for not going with the Late 80s/early 90s LA 360 Roller block over my 340. The only thing that kind of makes up for it is that 1: I paid next to dirt for my 340 block ($50) and 2: I didn't know about the LA Roller blocks until after I had my 340 and was starting the build for it.