Any idea how to get fittings out of aluminum intake?

I am throwing an old Performer intake and carb on my Ramcharger. I have to move the nipple for the heater hose and need to remove it and a plug, neither of which will turn. I've soaked them in penetrating oil, tried extending the wrench for more leverage, and against my better judgement I used a 3/8" electric impact. None of that budged them. I even tried my 3/8" air impact and it didn't do anything either. Anyone have any good suggestions? I borrowed my torches to my brother a few weeks ago so I don't have access to heat.

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