Zero '69 RRs built with 440s, except for the A12 cars. Period.
No 440s in them for '68 either, and for '70, again only 440+6 cars and the Superbird.
Rad support # (it's a partial VIN) should be pretty obvious, unless there's a ton of paint or the upper yoke was replaced.
Heck, if the car's that cut up, it probably doesn't matter what it came with; odds are huge it was a 383 car, though.