71 GMC engine swap-arino

[Kalums]

Well guys this is going to probably be a lengthy thread but I'd rather start one and ask a bunch of different questions than 80 different threads. So here goes... :
I'm going to swap the motor out on my 71 GMC K2500 the engine that is currently in there has "issues" with cylinders 7 & 8. I pulled the valve covers and intake manifold. I have found bent push rods and stuck or bent valves also one broken exhaust valve spring (multiple pieces) I'm pretty sure I could probably get away with replacing heads, but I have an "L44" GM crate motor that I was looking to sell but didn't (I didn't think 1500 was too much for a crate motor, but apparently ppl in Phoenix do *shrugs*) this crate motor is a "1993 spec". GM part # 12681430 (discontinued/ superseded.) This engine was bought in 2017 and sat in it's crate in the plastic in a garage, until I got the truck in July. This crate motor has the spot for a mechanical fuel pump, but no hole to the cam and from what I've read probably doesn't have a pump lobe on the cam( but it is still a maybe).
Question 1) What fuel pump should I use as my truck doesn't have an EEC fuel tank and no way (that I'm aware of) for a "return line" from any pump? I was looking at the Carter #4594 or Facet solid state pump #40345 or #40109
2) Should I swap to a serpentine system or try and find new to me "correct" belt pullies?
3)What do I need to do to this engine before I swap it in ie check valvetrain lash, a marvel mystery oil "soak", etc.
4) Should I pull these rear oil galley plugs and "tap" them?
5) This doesn't appear to have the vertical center intake bolt holes, my Weiand Action Plus (8004) seems to sit flush. Fel-pro gasket #1205s-3 and send it?
For all of you guys that have done this before these may seem like silly questions but I've never swapped an engine before and most of the internet is such a pit of opinions built on lies and speculation that I'm more confused now than when I started.