As H said, the parallel condensers didn't come out until 134A was implemented.
You can tell a parallel condenser by the common tube running up the side. All cross tubes intersect with this tube.
A series condenser is one continuous tube from end to end. In my 71 T/A I have run 123A since 2002, first with the original condenser and then with a parallel. The parallel has more fins per inch by a big margin and I saw absolutely no appreciable difference in performance between the two. Both were ice cold.
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1978 Black & Gold T/A [complete 70 Ram Air III (carb to pan) PQ and 12 bolt], fully loaded, deluxe, WS6, T-Top car - 1972 Formula 455HO Ram Air numbers matching Julep Green - 1971 T/A 455, 320 CFM Eheads, RP cam, Doug's headers, Fuel injection, TKX 5 Spd. 12 Bolt 3.73, 4 wheel disc. All A/C cars
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