Actually I think it's an 800.
Being the self-appointed resident Bow Tie expert, a stock 350 with only a mild cam will not dyno more than 250hp REAL WORLD HP's and should never be run with more than 600cfm of carb.
I've had big blocks that dyno'd best with a 750.
Over-carb is the easiest way to kill a motor's potential.
My motor? Craig's List the 800 (if it is) and get a 600. It'll run circles around that toilet on a small cube, low compression motor like that 350.