Edelbrock mt-5 for 318

I have been fairly lucky heating the aluminum about an inch away from steel nipples with a propane torch until the aluminum gets shiny (near melting point, so be careful at this point) and then pipe wrenching them out. I’ve always used brass plugs with leaded pipe dope in their place. (Retired waterworks operator hack, lol!) It takes heat to get those out too but the galvanic exchange isn’t nearly as bad.