Dorian, IF you do manage to get that plug out without totally trashing the remaining threads,
RED Loctite a new brass or stainless fitting in there, and remind yourself to NEVER touch it again.
It's now permanent.
Before the intake gets installed, inspect ALL the threads, and repair them NOW.
It's a much harder job after the intake is installed. And use studs wherever possible.
I realize Edelbrock has it's own foundry, but I have always tried to stay away from their products
primarily due to their threads stripping out easily, even if anti-seize was used properly.
I have always had better luck with Weiand intakes. I think Edelbrock is melting down cheap
aluminum cans for their products.