Update.
Hadn't heard anything in awhile so I gave the machinest a call.
Ironically

he said he had just got off the phone w/the Chatt machine shop just alittle earlier.
He said they were able to repair the head but had to order new intake valves as the OE's were worn too much to salvage. Said I may have it back by next week.
We were both rushed so the convo was short & sweet.
Also said the price was still in the ballpark of his estimate.
So it looks like I'll be staying w/the 216 power plant

A friend has also offered me the loan of his engine hoist and engine stand so it looks like the ducks are lineing up

As usual, a question or three.
I've asked the machinest this and he's checking w/the shop that cleans his blocks but I'll float it by my fellow gearheads.
1) will acid washing, or whatever method is used for cleaning out a block, damage the existing main babbitt bearings?
2) is there a way to cover/protect them?
I know alot will depend upon the overall condition of the crank, rods and mains but the optimist in me wants to salvage/reuse all that I can

3) anyone know/recommend an east coast machine shop that can renew babbit bearings? within driving distance of east TN preferable.
Dave