HELP

I bought my first Honda ladys and gentlemen. A 1990 Civic Si. I had it shiped from Arizona to my lovely home in Detroit. I knew the motor was not stock and the seller wasn't clear on what motor was in the car. I pop the hood to a world of satisfaction followed by frustration and days full of research. My car had the ZC swaped into her. My research tells me it's not too shabby of a motor. I've been told there are no aftermarket parts for her and i've been told that a friend of a friend of someone im buying rims from built his ZC to well over 200hp. I want to start simple. Pistons, rods, cams, some adj cam gears and so on. But i don't know where to start. I need names, companys, brands that are well respected, i can look to for information.

After all that *** you didnt care to read two more issues i have...how do i know if i still have the stock Si trans or not?  And what went or may have went into the car to make the ZC swap posible?