GM360R

1971 model year
Mounds Road
360
regular gas (not a surprise, the 1971 360 was built as a larger version of the 318, only available as a regular fuel 2-barrel engine

I was wrong about the date, the next four digits (3527) are a Chrysler 10,000 day date code, commonly misnamed julian date. Anyway, your engine was built near the end of the 1971 model year.
"Day 3527 is Thursday, March 25, 1971"

Post a picture of the flywheel, both sides.

Has anyone out there used a borescope to look at a crankshaft through the oil drain hole? If the crankshaft has been neutral balanced, there WILL be slugs of mallory metal in the counterweights.

This is sounding like a very nice engine, at least the basis for one.

R.