[Sizzler]

There can be a doubt, even if it has the ridge.

Fact is, sideoiler, centeroiler, they either will work just as well. From some points of view, a sideoiler is not the block of choice.

Post 69 blocks should all be hydraulic lifter blocks.

Another fact is: if you're buying a 35 year old block, no matter what sort of ridges it has, or webs, or paint daubs, get it sonic checked. And it sounds like you don't know a lot about engines, so I'd invest some money in a local expert to examine and check any 35 year old block before sinking the thousands of dollars someone will be expecting you to pay for it. THINK, it'll be the foundation/basis for your entire engine and vehicle. If it's bad or lacking, the end result will be bad or lacking.