A couple of years ago I had my motor rebuilt, and the following were recommendations.
Do not remember all the reasons why, single lock tappets with the right base diameter are recommended. If the base is too small, not large enough diameter to match the cam lobe face, the tappet and cam wears excessively very fast. I believe there is also a preferred manufacturer of adjustable tappets. I did have to take my truck back to the rebuilder because one tappet would not hold adjustment. The rebuilder said that it happens occasionally and replaced the tappet. I do not know of using some Loctite on the adjuster tappets would help. Here is one string on the subject, if you search there is lots more strings on the subject. Look especially at post #8.
https://www.fordbarn.com/forum/showt...=valve+tappets.
Also recommended is replacing the head studs/nuts. Search and you will find the info.
Do not use the cheap exhaust/intake manifold kits/gasket . Use a copper/copper clad gasket. The brownish/tan stiff exhaust gasket can go bad quickly, mine only lasted 20 miles. this gasket was supplied in a cheaper gasket kit.
Stay away from the modern silicone impregnated head gasket, use a copper clad or the Best Graphtite head gaskets. The Best Graphtite works great, but the material can be very difficult to remove off the head/block if/when you may have to take the head off next time.
Use of the exhaust gland rings is recommended to help prevent exhaust manifold sag at cylinder 4.
The rest of what you ask can hopefully be answered by others, or perhaps try doing a little searching. This is the limit of what I learned, since I did not actually do teh rebuilding of my motor.