Hello René, welcome aboard the De Tomaso forums.
There are 29 forums here, one for just about every possible subject. The forums summary page lists all of them, plus a description of their content, to help you figure-out where to search for content, or where to start a new topic (thread).
BSFC = Brake Specific Fuel Consumption. "Brake" is another name for a dynamometer. Besides horsepower and torque, engines tested on dynamometers are usually monitored for volumetric efficiency and BSFC. BSFC is an indicator for thermal efficiency and mechanical efficiency. With BSFC the smaller numbers are better, and an engine's best BSFC usually occurs at peak torque.
SCJ = Super Cobra Jet. Ford used this name for special ordered solid tappet versions of their 1969 - 1971 Cobra Jet engines; the 428 Cobra Jet and the 429 Cobra Jet. I use the term to denote a very "hot" street camshaft, or a very "hot" street engine equipped with such a camshaft.
fps (feet per second?) = Yes feet per second. A foot is 304.8mm.