Reply to "1972 European GTS - Chassis 2609- Gr4 conversion project"

...My Opinion is, NEVER Mill the Top, unless You Want to Destroy the Value of a Rare Manifold, also make it useless for any Car other than the Pantera. I Use a 'Angle Plate Spacer'!

About Sealing? I am Talking about the 2 Front and Rear, END SEALS ONLY. I Clean BOTH sides of the Contact areas with a Degreaser, and Apply RTV on Both Sides(Manifold and Block) of each end, Lay it on THICK and smash them together when the RTV starts to get tacky. NO Leaks for Me. The best thing about using RTV Instead Of The 'End Seals', is the RTV can squeeze into All the Nooks and Crannies, Especially in the Corners and in blending into the 'Port Gaskets'!! The End Seals Cannot do this! And if You Cover the End Seals with RTV....Think About this!! You are trying to SEAL the SEAL!! And RTV does Not stick so well to Rubber, I've tried it, Once....Decades ago.
I still use Composite Gaskets to Seal the Intake PORTS.