3.1 to 3.8

I have this idea. I'm going to get this 1990 chevy lumina for free. Well is has a pussy 3.1 with like 190,000 miles on it. I was thinking of stepping it up abit. now i was thing going 3.8 but i cant find anyway to buy a kit. But first of all can this be done which it should be able too. and where would i get the parts could some one give me a idea. but i know it wount ever keep up with my caramo. But this lumina is going to be a little experiment car. some if some one could give me an idea that would be great and thanks.

Post your engine swap question in the proper forum please, this area is for intro's only.