Head gaskets for 360

As for the china walls;
If you mill the decks or the heads, the front/rear of the intake will drop down some. Almost right away the cork gasket will not compress far enough and the pins will interfere. They are only there to locate the cork gasket so pull them.
Throw the gasket away and prefit the intake to see how much gap is on the china walls. If more than zero, yur good to go, just build up the area with RTV. I put the RTV on the wall and skim-coat the intake. This is just in case the intake doesn't want to stick to the RTV on the walls, it's better to find out now, while it's easy to fix.
BTW; it's almost guaranteed that the cork will eventually seep oil. So most of us just eliminate it.
BTW2; fresh RTV will not stick to cured RTV; so if you ever have to take the intake off, yur gonna have a fun time getting all that RTV off. And it's ALL of it, gotta come off; and I never discovered any chemical cleaner that would touch it
I used to freshen my engine every winter, and that RTV pissed me off about six times. lol.

As for the headbolts.
My 11/1 Scr 360 has the factory 1971 headbolts in it and they have been reused at least SIX times with no issues.

As for the FellPro 1008s:
Mine have been reused a few times. You never know until you try it. they are .039 thick, compressed.
I used some .028 sandwhich gaskets the first time I assembled it. They barely made it thru the first summer, with one fire-ring well on it's way to the valley. I do not know the brand. They were black I think. They came off in pieces, no way to reuse those! They were in the rebuild kit. 1053 sorta rings a bell, sorta.