Go and look in "US versions of Celica 1971 till now" that will give you engine sizes, power output etc, As for parts, new or used? new parts are easy to come by, just go to your Toyota dealer, 2nd hand parts should be fairly easy to come by, there is a whole mine of information from people here who would only be too willing to point you in the direction of a good second hand parts dealer etc, and there is usually someone about who is breaking up a car or selling on old parts after upgrading. Other than that, ask all the questions you want and someone willl usually answer.

then there is always good old e-bay
I cant help but notice some similarities in our sign in names!!!!!!!!!