I've given thought to an engine swap for more HP and ...
I figure it has to be an all AU engine to keep weight in check. The AU v8's are way to much money, and the v6 options are limited (suzuki v6, mazda v6?, ...)
I've also thought a diesel swap would make a nice change (e.g. VW tdi), but complex.
I thinkin now to just take the old 8v out, add a cam, bore it, probably port it, and hope to get near 100hp when done. It's getting by today, but just tired, so this winter I'll rebuild and toss in some upgrades.