Nick's Garage dyno's a 318 Stroker.

If you generalize most street, street/strip type engine builds, cams are in the 215 to 245 range with CR in 8 to 11:1 with appropriate intake/exhaust, Heads in the 175 to 325 cfm range making 1.7-1.9 Hp per cfm and 1.1-1.35 lbs-ft per cid with peak hp in the 4500-6500 rpm range and peak tq 1000-1500 rpms lower.

If you average that out a 230 cam with 9.5:1 cr will make about 1.8 hp per cfm and 1.18 tq per cid give or take.

So 50hp = about 28 cfm