spending the week in Austin, TX with my grandson back at the swap next weekend. Probably start with getting the fuel system set up. Then I'm going to double check the timing chain gear dots and whether they line up just right. Having a bad feeling that they might not be right. After that, the wiring harness.
When I do them, I spin the engine around twice, or more. If they still line up, I'm happy.
There's really no reason to do oil pumps on LS engines, they aren't really failure prone, just the O-ring that goes onto the pickup is.
The pushrod length doesn't have a formula, per se, you just use a adjustable length rod and mess with it until you get it perfect. In your case since you didn't go over .600 of lift, and didn't cut the heads or anything, the factory 7.4 length should be fine.
I actually just put a very similar cam and springs in mine, but you're moving at a fast rate than I am lol.
For the fuel system, Spectra makes a tank with sending unit for 87's that's a drop in for older trucks. Then you can adapt the lines with Russel fittings, like this,
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