I’ve used Felpro and not had any issues.. I used the cork end gaskets with some RTV in the corners. There might be different sets offered, I did mine over 20 years ago. I think there is a set with rubber ends. Some people use RTV instead.
I did use a little spray adhesive to hold the gaskets in place. If the distributor is out, you can drop straight down. Install a couple studs to guide you down so you won’t need to shift the manifold.
I'm thinking I should redo my intake gaskets before dropping the engine in my car. I noticed a small dribble of coolant not only around one of the new casting…