I was chatting with one of my car buddies over the weekend and commented that I regretted having started this thread.
Putting a 3.5l & 265 in an e9 is a much milder conversion than a Mazda drivetrain in an MG or a small block Chevy in a BMW. What you and Don are doing preserves the marque consistency and is theoretically reversible.
The thing that set me off about that MG/Mazda project (which is what started this discussion) was that the builder gave up on it prior to completion. Until you've built a hot rod, you don't understand the difficulties of hooking up all of the bits and making it reliable. It's easy to sit at the keyboard and say "hey, let's put a 427 hemi in a Fiat 500", but getting the clutch linkage, exhaust system, steering column, cooling system, ... to all work in a street environment is a tough challenge. Most of these projects either get abandoned mid-stream (you've seen the ebay descriptions saying "90% of the work is done" - yea, right!) or are called "race cars" (even thought they don't conform to any sanctioned class) and just get trailered from show to show - like that V-8 powered 2002 pictured in post #17.
The concern I was trying to express in my first post is that the MG/Mazda builder will do the same thing to his 2800cs: get half way through a drive train conversion, paint it some strange color, and then realize that with 6 U-joints in the steering column and chronic overheating problems, it will never be streetable. Back on ebay, with a comment that he's only selling it because he needs money for his new ______ project.
I know it's fun to build hot rods (just look at the photo in my avatar), but if you must cut up a rare car, at least complete the project.