HF leakdown test is a Piece of Big Steenkeeng SHTUFF but here is

Why not? Most of it is there, all it needs is one 100psi gauge which is there, and the proper orifice. A Matco is 160 bucks

If you have a better idea, "bang for the buck" by all means let's hear it
This is engineering ..and hot rodding, at it's best...Why spend the money, when you have the necessary tools & knowledge? Not everything works correctly, out of the product box.Open ,your minds....