351c 2v intake manifold gasket issues

Recently I noticed some oil build up on the rear of my 351c intake manifold. Its an aftermarket edelbrock.

Ive read that its super common for the gasket to break down in that area so I plan to replace it.

Based on the gaskets, I presume ill have to put some sealant in the corners. I am planning to use permatex Grey. I know its rated up to 450.

Anyone have any insights? Better sealer recommendations?

I use The Right Stuff on intake gaskets. The front and rear cork gaskets I use contact cement on. Popular and available contact cements are 3M EC1357 or 3M Fast Bond 10.