273 Coolant leak help

Well I was noticing some issues with the engine temp on dads cuda. Started late last year, overheated(failed t-stat) last year. Replaced t-stat(with jiggle valve) and tested before install. But gauge was now always pegged. Replaced coolant temp sensor(stock). Still pegging gauge. Replaced gauge this year and everything was good. Ran hot a bit on 90* day, engine was around 220* on gauge. Boiled some water/coolant out and had to add a couple litres to top up. I thought screw it, I had a spare 7 blade fan and swapped it in exchange for the 4 blade. While in their I figured I may as well remove the factory ac condenser as its blocking air flow to rad. It was tempting to leave it in as it offered "protection" for the factory rad. Rad was in great shape. We sent it to a shop and had it dipped and psi tested when dad bought car in 2012.
I stripped, straightened fins and repainted rad. Topped up with new coolant and distilled water. 70 coolant 30 water. Fired it up, added a bit more coolant and noticed a leak down on ds. Initially wasnt much with rad cap off, but once engine was up to temp with cap installed it got a lot worse! Checked engine oil dipstick and no coolant there.
Initially it looked like behind the timing cover, but would coolant be coming from there?? Im sure as hell hoping its not a head gasket.
Heres a video
Thanks for the help.