I would say 260-265ish @ .050, 110 LSA.

I would also say that 1 5/8 headers are too small for any RB Mopar, and way too small for that stroker. 1 7/8 at least on a 500 CID stroker. I didn't know anyone made them that small for big blocks.

Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street