Yeah. I'm a fan of the pewter after rocking it for 10 years. She's just lived a rough life and the paint was showing it.
I used the factory S10 foam gasket with a relocated hole to fit the T56. On top of that I have a 4th gen Camaro 5 speed rubber floor pan shifter boot. 6 speed is similar, but slightly different. I don't think it would make a huge difference in fit choosing one over the other. I found the 5 speed boot at the junkyard, so I used it.
I cut the floor to fit the S10 foam gasket like it was from the factory. If I were to do it again I might try mocking up a piece of sheet metal with the Camaro boot pattern to see if I liked that better or not. Right now I'm digging the flange of the Camaro into the floor to get a seal for that and the foam is doing most the sealing work. I think the flange going through the hole in the floor and digging into the foam would be more optimal, but this works.