Hey, nice looking GP. Makes me miss the 84 I once had.
Just to eliminate a bit of confusion on the the engine swap, the acronym BBC stands for Big Block Chevy. Since you dropped in a Cadillac block, it's not the correct term for your swap. Very nice car tho.
What did you do for the exhaust? Are you running headers or the stock exhaust manifolds? What did you have to do to get the engine to fit?