383 magnum versus 383 big block

my question would be... whats the compression like on that small block to get those numbers in comparison to the B series 383?

I would actually say go with the Big Block 383 is the power level is going to be the same. The big block is gonna be making the same power, with less stress and less cost than the 318 stroked., in theory anyway.
I used 9.5/1 as a baseline for both.