I'm 63 and about to take delivery on SPF 2457. The first 427SC I saw was when I lived in Manhattan Beach, CA in mid 60's. Dick Smothers (Smothers Bros) had one and we all hung around his place on Saturday morns to hear him crank it. In 1969, I bought a 61 AC ACE but sold it when I got married 6 mos later. (Wish I'd kept it!)
