If you’re going to use the hydraulic roller supplied in the TFS kit with 13:1 or better, it’s going to be close enough to the limit of a stock block to reduce its life expectancy. Without doing the math I would expect between 1.2-1.4 hp/cubic inch near 6000 rpm with a boat load of torque. What I can say with great certainty is it should be a real handful in that Willys, worlds away from the slap worn out 440 that you had in it.
