I'm currently rebuidling the engine. Lots of good news, numbers match, no cracks or bent head or any of the serious stuff. But this engine must have been apart, and then assembled to sell, not to run. It had 4 0.020 pistons and 2 STD

. Both cams were just installed without syncronizing to crank. Thankfully I couldn't turn the crank by hand, or I would probably have bent a valve.
All is better now, many new parts going in. My question is valve stem seals. There were none in the head, but as you can see from the text above, that doesn't tell me anything. So:
-Did the 3.8 use valve stem seals?
-Only inlet valves, right?
-There are two kinds?
-One kind needs machine work to fit?