Very interesting thread and get's an itch going for another project! =) I blew my engine (hole from a piston rod) a while back and had FullBlown build a new block w/ a flex fuel kit.
(Referring to LS swap) First off, that's pretty sick. I would think the total weight shouldn't be too much of an issue when doing a large swap project. I honestly think the weight would be beneficial to the car's performance/handling, especially for being light and not AWD. But I don't race; I'd rather have a fun and challenging project than the fame and glory of a win.
Can't wait to see what choices you make and how your projects goes,
Cross. Best of luck!! Oh, and if you need some FA20 parts instead let me know. I still have an engine wiring harness, cams (6K miles), two stock clutches (looking new), and various engine parts from my rebuild.