Performance Questions 225 vs. 360

I've read the tranny crossmember + driveshaft need to be changed, it was from a source I felt was knowledgeable, though not 100% sure. I did say "maybe" for the radiator, brakes, and torsion bars. But even if you had a 22" radiator the inlet/outlet position is different, so you have to find a usable hose. Not hard or expensive, just another additional thing. There are aftermarket Slant 6 to Smallblock motor mounts available. If you are only using factory/OE parts, wouldn't that entail changing the K-member? Iwas thinking kick-down linkage when I wrote Tranny linkage. That would be a junkyard item.
Agree 100% that tuning a turbo Slant will take more finesse than a stock 360, and more power naturally leads to harder driving...so more risk for breakage with either choice.
Also, I saw nothing in the OP that suggested modification/fabrication was out of the question.
Now this all just the opinion of a guy (me) who is currently planning a mild Turbo Slant build...there 'personal bias'

All good, just making my point. There are always going to be pitfalls/conflicts/compromises when you start altering/modifying any type of factory equipment. My one caveat is that it would probably be more realistic to do the small block because it's all right there in front of you, you just need to go out and get it.

Adding a turbo to an older engine is literally an exercise in engineering. Obviously that's fine in itself if that's what you want. But without a doubt, I think the OP would likely rather get it done and drive rather than trying to sort out all kinds of crazy crap that no one has any easy answers to.

It's OK to think big on the Slant but if it were me, I'd be looking for a 360. It will get the job done so much easier and can be easily upgraded later on down the road if desired. There's really no comparison between the two.