orig cast iron intake? replace it. replace the heads too. they are both more likely culprits than the block. and you need them for next motor anyway...

Just a quick follow up for those that may come across the same problem... I pulled the intake manifold (lower) and sent it out to be boiled and blasted and checked for cracks... Shop said all good. Told me I may need to replace in a few years but I hope to have new power by then anyway. I put it all back together with new gaskets and sucked out all the old oil and replaced. At first it was still milky (leftover residue) but after running on a hose for 15 min. i pulled the dipstick and CRYSTYL CLEAR!!!! Of course after moving stuff around upon removal I now have a leak in my fuel rail but thats a whole other issue due to corrosion. Ordered a new rail and I should be all good by weekend.

Thanks to all who helped... really appreciate it!