Correct - 85 and earlier 350 or smaller cid v8 flywheel. The holes will need to be drilled for 1/2" flywheel bolts. This does not need to be machine shop precise, you can do this at home as the holes do not locate the flywheel, the center flange does.

"The first rule of overkill: You can never have too much overkill."
"Overkill is underrated."