Series 2's and Series 3's are pretty much the same. The main difference was in the blower design, the Series 3 blower's improvements net it another 20hp over the Series 2.
Early 3800 Series 3 SC engines received Series 2 internals (mainly, cast connecting rods). I have verified this on 2 engines, personally. Later Series 3 engines received powdered metal connecting rods which are stronger or weaker depending on who you talk to.
All Series 3 engines came with drive-by-wire throttle bodies and PCMs that can be a pain to work with in a swap application. The good news is you can buy an adapter plate which allows you to run a cable-op throttle body on one of these engines and an earlier PCM which will be easier to tune for a swap application.
Many vendors in the Fiero community sell conversion parts for the Series 2 & 3 engines. You are NOT going to find much support for the Series 1 3800's. Series 1's are good engines, but they don't make as much power as Series 2's or 3's, and they are getting harder to find without a ton of miles on them...
-ryan
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