Stock Hydraulic Lifter Preload Spec?

My dad and I are putting a mild 360 together for his D100 and need a set of pushrods. Since the heads and block have been decked and a number of other things have been changed, I'd like to measure for pushrods to see if the stockers will work or not. Do you guys happen to know what the stock spec is for hydraulic lifter preload? The lifters he's using is a stock replacement from Sealed Power (HT2011).

I've called federal mogul (sealed power), but he couldn't give me an answer, only that they're lifters are built to "factory specs" and I couldn't find the spec in the FSM.

I'm wondering if I could just measure the range of travel in the lifter and split the difference, or is there an actual recommended range?