Nice FC, needs some love but what old car doesn't? Thats the way my TII looked when first got it, minus the rust tho. Definetly go for the rotary instead, not saying the ls1 swap wouldn't be fun as hell, but just saying that its more unique to have a rotary in your engine bay. If you want a head start with having an FC w/ the 13bt, mine is for sale. It has all the good stuff like lsd diff, 5 lug, S5 tails, single turbo, wheels, suspension, exhaust, gauges...etc. I love this car but need to see it leave. Good luck on yours.