Have it soaking in pb now, why not remove the radiator cap when I run it?
Good man! Taking the cap off will work nicely and keep the pressure off. You'll still have hot coolant to deal with. Getting scalded with coolant is no fun.
Progress report when available, please.
p.s.--How cold is it up in NE Ohio on a Sunday night? You're made of tougher stuff than me, scrambling around on the concrete garage floor in the winter! Admirable, to say the least.