Happy New Year all... so heres an update on my issue.
Last night was cold as hell here in CA so I decided to just test the Jerry rig I did the other day (1/2" x 2" copper tube amazing GOOP'd to broken heater core inlet). I just connected everything up, topped up the water/coolant and test drove around town fro 20 mins. Then took her out and drove about 40 miles round trip and everything was fine. Nice to have HEAT on a cold NYE night! I still need to re-do this Jerry rig with epoxy. I think everything held up because the cold weather. I monitored temps at the inlet hose and it got up to 158-160 max. The GOOP states its only good up to 150 degrees and thats where my paranoia sets in!