Yes the BSFCs are way off. So back calculate the horsepower using the fuel flow and say 0.45 lb/hp-hr. It'll probably give more reasonable numbers. All said, it's a heck of an engine no matter what the HP and well worth bragging about. It's going to look super in that hot rod.

R.

Another rule of thumb is it takes about 0.6 scfm to make 1 hp. So divide the airflow by 0.6 to get power.