Custom pushrods, how much stock lifter preload?

Ted Carlson said

If you are not making a high RPM race only motor. you don't have to have roller rockers. In my opinion you are taking a shortcut. A shortcut is the quickest way to somewhere you didn't want to go. Get the adjustable rockers. It is almost impossible to make the pushrods the right length for proper preload on all 16 lifters

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Ideally that's what I would do but school is starting back up so I can't work as many hours at my part-time job; if I waited until I had money for adjustable rockers it would take another 2+ months to get this thing running especially since there aren't many decent budget-minded choices when it comes to LA shaft rockers besides the factory 273 ductile iron pieces; still need to do some more research on that to find ones I like.

Anyway I've decided to go with .080-.090" preload; people running less report a noisy valvetrain and according to Hughes Engines and a couple other places it seems like the Magnums like a lot of preload.