According to the old B&M Supercharger Tech Manual the 144 Blower on the 302 with stock heads [pre 87] B&M 90770 cam and a 750 carb the HP was 335 @5500 rpm
They substituted a set of Motorsport heads [ 1.94 I & 1.60 E] and the HP was 410
With the same cam,carb and Motorsport heads the 351 had...