My radios back then were a Knight Kit Star Roamer, a BC348, a BC453,
and a RBB-1. I used the BC348 as a highly selective, second IF
(85kHz) conversion to the other sets.

73's
Richard Clark, KB7QHC

More likely, it was the BC-453 you used for the selectivity although it
wouldn't tune as high in frequency as the IF in the BC348. Must have used it
for the Knightkit

W4ZCB