So I guess this is a collapsed lifter?! Just using a pushrod (which I guess is magnetic) and not pushing down, but pulling up:
I had a few like that of the old ones.
Heat crossover blocked off. I heard metal from a beer can will burn through, so I used the bottom of a coffee can that appeared strong enough, but also not too thick. Thanks for the tip with the red RTV @JDMopar! And yes, I got the Fel-Pro 1243 printoseal gaskets just like last time, but back then I cut a hole in them to let the heat through.
New lifters are in, pushrods and rockers are back in place. I cleaned up the intake a bit more, but then it got dark, so I decided to install the intake tomorrow.
I always wanted to try bluing on bolts so they won't rust. Came out ok, heating them over an open flame for 3 minutes and then submerging in vegetable oil ended up being the best method.