Well, since the collective has convinced me that it is still worth it to swap in a SBF, and I happen to have (most of) a complete 5.0 out of my old 89 Mustang sitting around, I'm trying to decide what I want to put it into. Intended use for this car would be maybe 50/50 street vs. HPDE/autocross. Needs to be something where I can pick up the recipient in halfway decent and rust-free condition for around $2K, plus or (preferably) minus a few hundred. I'd like it to be significantly lighter and better handling than a Fox Mustang, because otherwise, what's the point? And I'd like to be able to do this with a kit or at the very least some pre-designed mounts. I'm pretty handy with a wrench and have a good, dedicated work place with plenty of tools, but fabricating from scratch is a bit beyond my ability.
Sorry, no Miatas. BTDT, and I'd really rather have a roof. Plus, they just don't do it for me.
Here are some contenders that I've thought of:
FB RX-7: Easy and cheap, I've had one so I know them pretty well, they are dead-simple cars. Very light. The main cons are the primitive suspension and recirculating ball steering.
FC FX-7: It's been done many times, so I'm not reinventing the wheel. Much better brakes and suspension than the FB, I like the looks, nice interior.
E30: My heart and my growing love for the propeller make me want this. It has been done and mounts are available, but from what I'm hearing, people are still working out the bugs on this one, especially with regard to things like power brakes. I'm leery.
E36: This has been done more than the E30 and is supposedly easier. It's a better chassis than the E30 in every way, but it's a bit heavier, but I have one now, and it's a great car, but the styling is bland-o-rama to me.
Volvo 240: I don't know a lot about this one, I've heard it's easy and the cars have great stock brakes. To be honest, the cars don't do much for me, so I don't really know why I'd bother.
Early Datsun Z: Light, but tough to find a rust-free example, and the only mounts I can find are for the 240 and 260.
Datsun 280ZX: I have an irrational love for these cars, despite their boulevard-cruiser-ness, but the only V8 mounts I can find are for the SBC.
Feel free to comment on any of these or suggest something else that I've missed.