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the manifold must come off. but it is not a 8 hour job! to remove the manifold takes 15 mins and about 20 to reinstall. the valve covers take another 25 to R&R.
the hardest part is if it has a A/C pump. that makes dizzy removal a PITA. i find intake manifolds a snap. my FE is much harder to do because the valvetrain must be removed. but 351c,351m/400 are pretty simple. sometimes those small bolts on both sides of the carb which go vertical get rusted into the heads.
I have replaced it before but with my kids running around always wanting something and me being **** about cleanliness and perfection it takes me awhile. I show it a little so everything has to be perty. what do you mean aftermarket gaskets? I thought they all had the turkey tray for the oil galley, I thought that kept the heat off of the part directly under the carb.
Stock type is the one-piece stamped gasket. Aftermarket has separate pieces for intake & end rails. You could cut the metal part out & use it with the aftermarket gaskets if you wanted to keep it for oil splash.
You and my dad must be long-lost brothers, lol I'll have to search the archives, but it seems that Eric, (Torque1st), recommended just a couple 3/8" holes. I'm going to have to go look now