Need Advice On Magnum Crate Engine

The heads being milled an unknown amount is really no big deal other than you now must calculate your compression ratio if you are trying to get to a certain number. The pushrods should be the last thing you buy after the heads are on and torqued and you know what rocker you’re going to run. Just buy an adjustable pushrod from one of the cam companies and measure the length you need. It’s super easy to do it the right way. I would not just bolt on stock stuff and run it.