340 vs 360 confirmation

I picked them up yesterday, along with a set of '75 high back bucket seats with tracks in very good condition , the stainless drip rails and wheel moldings (all in excellent condition), hood hinges, AC compressor brackets, hood bracing, an emblem or two, and a few other detail bits I was missing, all for almost nothing. Just a local Mopar guy, "friend of a friend" - now a friend after this past week - who was looking to help out instead of get rich. I'm amazed how supportive Mopar folks are of each other, in person and here.
Is your car a 75 model year? Those seat tracks you picked up are slightly different on the drivers side to account for the different floor pan to house the catalytic converter below compared to the earlier year seat tracks.