72 340 actual hp?

Allot less 1972 was the year 340's lost 10.5 to 1 compression ratio in favor of 8.5 to 1 for emission considerations. It also picked up the 360 head with smaller intake valves. And was phased out by the 360 four barrel in 1974. The 360 four barrel 74-76 is the last of muscle installed in Dusters and Dart Sports. The 72 you bought can be built to almost early spec.'s but it will never be exact production numbers. And the 340 6 Barrel was a whole different engine. I wish I had one, used too long ago. They were built with a special thick web block, specially machined heads, adjustable rocker arms and the unique carburetors and intake manifold. That engine was the LA peak performer, hope this helps.