Strange Engine Number? Stupid tuning questions

Bigger cam in the 260 degree range, header into 2 1/2 pipe, 2 brl intake and carb. Mill head .080, electronic ignition.
Now to get it to feel like 180-200 hp...you'll need gear and 2500 stall convertor.

145hp was a generous rating from th factory.
Torque is what makes the 225.