Changed the intake manifold, now there's an exhaust leak between manifolds.

I found the Remflex website and ordered a gasket for my Slant 6. But for now I'll use the steel gasket with high temperature RTV and carefully align and then tighten the manifolds together off the car.

I'm planning engine work or at least a good head porting / rebuild job later this year, at which point I'll use the Remflex gasket during that reassembly.

$23 for the gasket, but $17 for UPS shipping!

I used my Dremel grinder with a coarse tooth carbide cutter today to dig out the side of the adapter plate enough to get the inner bigger bolt in and tightened down. I'll clean up the steel gasket and manifolds and reassemble them with a heavy layer of RTV, and carefully tighten them together. I wasn't putting enough importance on the security of that joint. I had to clean the whole bottom of my newly painted intake to get all the black carbon off of it, it was leaking about 3/4 of the way around.

I saw that Remflex offers uncut rectangular pieces of their material. I half considered getting one of those and trimming it to size, but leave the center area solid, to keep some heat off the bottom of the intake. I think a thin piece of sheet metal might be better for that.