The 200r4 behind the 3.8 will have both the SBC and the BOP bell housing patterns. No adapter is needed. The 3.8 starter is on the same side as a SBC, I think it uses the same starter. The distributer wiring may need to be lengthen too reach the back of the engine, the Buick has the distributer in the front. Been a long time since I did a swap from a 3.8 to a V8, I think the engine mounts on the frame get moved further forward, I think the holes are already drilled in the cross member.
Of course the exhaust and all the engine accessories will all be starting from scratch.
The stock 200R4 behind a 3.8 is not going to hold up very long with much HP in front of it. Really should have someone that knows how to build up a 200R4 for more power go thru it or you will be hiring someone to work on it again pretty quickly.
200R4 has a pretty low first gear and helps with the take off even with highway gears. That is something you can always change later.
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