Sleeving the bores will save the engine for future overhauls. When the sleeved cylinder wears out you just re-sleeve it!! I don't see any drawbacks to sleeving.
My daughter-in-law is a nurse........everyone knows a nurse, I had her bring me a large syringe. That worked perfectly!!! I piece of plexiglass, some grease, clean surfaces and you're good to go!! It's actually very, very easy.
This is how I did it at home. It was inexpensive and easy! After measuring each chamber you can simply remove a little material on the combustion chambers that are too small (lower ccs) until they match the largest ones..
I've had many 350s but never a 383. Down here in S.Texas mopars are a little rare. Chevys are cheap and abundant. The yellow Barracuda in my avatar had to be shipped in from Arizona. I had a Barracuda back in the 70s and always wanted another one so I found the yellow one and bought it.
If I remember correctly the last thread on this subject basically said that it depends on what kind of chain you have/buy?? The type of chain has some determination on whether you need (or can use) a tensioner.
If it was me I would remove the chain and deburr/smooth all the exterior surfaces. The exterior surfaces have no effect on timing since the chain wear occurs on the inner part (critical part) of the chain.
I only know because I was in the aircraft industry and we used Locktite for many applications. It will wash out in the presense of water/moisture. Once it sets it's waterproof as far as I know.
I didn't know if there was any standing water in the block. If there is water in the block the water will wash out the Locktite before it dries. Once it dries (in the absence of water) it should be OK.
The center readings will almost always be higher because you have two cylinders dumping right next to each other into the same area of the manifold. Not sure about that back one on that one side.
He's not building a race motor or a drag motor. If it's a simple street car he could run it the way it is and save tons of money. Every one saying that it needs a complete overhaul are probably not willing to pay for the machine shop bills??? I would lap the valves and run to see what it does.
You would think that an experienced company like Lunati would have a bright orange warning label inside the box telling you that you should disassemble and lube before use. I mean, come on...........do they actually want customers to be unhappy!!!!!!!