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Check the fender tag. Rallye cars will have the A57 code on the fender tag (and build sheet if it still exists).
Not all 340's were rallyes and not all rallyes were 340's (or in 74, 360's). My 74 rallye was a 318 car.
Rallye cars will have the bulge hood, rallye gauges, front and rear sway bars, and the fender moldings behind the front wheel opening.




Also in 73, if you ordered just the 340 engine option w/o the A57 pkg, it came with the rallye hood, HD suspension, F70-14 WSW, 7-blade torque drive fan, and dual exhaust with the tips.