I have used one on several HEI's...might not have been Crane's, but many are the same. They work well. What I suggest you do is to get a dial back timing light or the correct balancer tape so you can figure where your at & from there, where you can be before you notice ping. You could do it without really know the "number"...if it pings on this notch, move it back one & repeat however it's best to know where the mechanical is/can be & go from there.
Many HEI's have too much vacuum advance so if you get the distributor to have the "correct" mechanical advance...you quite often end up with what your finding, especially in a heavier vehicle like a truck.
I would try to get around 34* in mechanical & work with the advance limit stop (the odd shaped tooth thing) in the kit to hold the total to what ever you can get away with...may be as much as 40*-42*or so...which is really only 6*-8* of vacuum. What you may very well have is 30*-32* & 14* added & it pings. You could improve all around drivability by spending a little time here. My Two Cents, Lorne
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