[dtmaso]

Date Code: '2L25' with an 'E' above it (two small dots beneath the '2')
'66 427 P 2'
'12 DIF' (foundry)
Absolutely no 'Casting' mark
Screw-in freeze plugs
Side oiler screws along driver side above cross-bolts
Vertical webbing on the outer right side of block.

I've read that this is a 1972 over the counter, service block, and that they had core-shift issues and other reliability problems. And that since they were based on the 1968 block, were drilled for hydraulic rocker system.

It's in a car now so it's impractical to dig deeper for ID numbers, etc. It's allegedly never been bored or damaged (nor is any 'patchwork' evident during inspection).

What's the value of this block?
How would you rank, in order of preference, value and reliability, it compared to a 66 side oiler or a top oiler?