In that era, radios were optional, so "radio delete" wasn't really the option, as it would be nowadays. Heaters were generally standard equipment, but were commonly deleted on factory race cars as well as cars ordered for tropical climates. Likewise (as regards radios), clocks, windshield washers, seat belts, and outside rearview mirrors were optional until fairly well into the '60s. So they weren't so much deleted as not ordered. It's semantics, I know, but accuracy exists in the details of language and terminology as much as in a restoration.
My '63 Savoy's fender was never punched for an antenna as it was not ordered with a radio. Likewise my '68 Roadrunner.