It was Heartwork.
He told me later that he went straight to the cashier and asked for the album, specifically naming the band name an album title. The guy in the record store just looked at him in disbelief, because my dad looks nothing like a Carass listener.
I told my dad that the guy in the record store looked at me the same way when I went in to buy him a Rod Stewart album, age 14.
We decided that were even!