273 advise needed

First I know there have been several 273 rebuild discussions here and I've learned a lot already reading through toolmanmike's build and others. Most of what I've found are builds of a 273 two barrel, or have a lot of technical information that I don't really understand. I already have the commando engine, and since I'm paying labor having all the parts I need when the car goes to my mechanic is very helpful. Here is the backdrop:

1965 Barracuda, 273 commando, original engine, the car has been sitting for possibly up to 32 years. Last known registration was 1992 in Texas. Wish to keep the car as original as possible while refreshing the motor, maybe adding 25-30 Hp while doing it wouldn't be a bad thing! Compression on 1&3 was around 60 psi, so I stopped there. Mechanic says this isn't a sure sign it's needing rebuilt, since over time the oil will be pushed out of the cylinders and until those are filled again compression will be low. Freeze plugs are shot, the ones I can see along the bottom of the block are all gone except for one. So while the engine is out for freeze plugs what are the must do things, optional things, and stick with what you have things?

Already having the commando 4 barrel I don't know if getting the Egge lifters and a new cam are really necessary. I have experience with Hughes engine and have never had a problem with anything I've gotten from them.

Exhaust manifolds believed to be original, but the 2465847 might be a plus. A guy on fleabay is selling one at $175 calling it a rare high performance part... ??

Is the egge engine kit overkill for what I need. I see several options wanting the buyer to choose the oversize, and I'm not sure how to answer that if I bought this kit.

So if it was your car, and you were pulling the engine to replace freeze plugs, what would you do for sure. What would be good ideas while the motor is out, but not a must. And what would you just clean up and put back together?

Assuming this engine is able to be rebuilt, I will likely base my rebuild on the advice I get here, because I know this site has the most knowledgable members when it comes to these early A body cars with these engines.

Thanks!