Bought the 68 chevelle ss car. More questions plea

[cuda]

Thanks for everyones input to the post about the 68 ss numbers matching 396-325hp car. We picked it up yesterday. Car is even better than we thought. Runs great and is rust free. Trunk is as clean as i have ever seen. The blocked is stamped ET- is that for the 325 hp motor? Also who is the best source for parts ie carpet, seat covers, poss door panels? I have used year one and legendary for my mopars but i have never owned a chevy.. Got to start somewhere ha ha. thanks