In May of 1970, CAR CRAFT Magazine ran an article titled 'Econo Racer Test' which pitted the 4 strongest and cheapest performance cars against each other - here's the results:
#1 Duster 340 4sp w/3:91's =
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#2 Swinger 340 3sp w/3:91's =
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#3 Nova SS 350 4sp w/4:10's =
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#4 Mach 1 351 4sp w/3:50's =
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Then in April of '71, CAR CRAFT ran an article titled 'Drag Comparison' where it put the Demon 340 with the new 850cfm ThermoQuad up against a Hornet 360 and this is what it ran:
Stock form:
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W/Headers:
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Lots more 340 information, production numbers etc. here:
https://www.swinger340specials.ca/340-review