When does money outweigh sentimental value? 1968 notchback build thread

And this post will bring me current to today Sunday the 12th. So after my drives, I went ahead and checked fluids. Coolant was nasty. Upon removing the radiator cap and seeing the brown floaty garbage in there, I knew where I'd messed up. When I was putting fluids in the car initially I had a bunch of dexcool and that's what I used in the barracuda. However, what I didn't think about is dexcool doesn't mix with air very well. It works fine in closed loop systems but not so great with air included systems. So I've been spending the entire freaking day drain and filling my coolant system. Trying to get all the brown nasty out of the block before I install the new cold case radiator, GO5, etc.