Cyclone is 3460 lb (weighed on certified scale) less my carcass but with 20 gal gas tank pressed full, complete stock interior (incl power windows), fiberglass hood, alum intake, headers + about 100 lbs (est) of Dynamat.
The 1967 Comet fact sheet quotes the base Cyclone 2-door hardtop at 3228 lb curb weight (all liquids plus full tank of gas) + 266 lbs for the FE engine, 59 lb for the C6, 31 lbs for dual exhaust and 21 lbs for power windows (all weights additional over the base 289 model) = 3605 lb.
If all this can be believed, the net weight saving yielded by a Crites hood, PI intake and headers, and assuming the additional Dynamat weight is probably offset by the amount of factory sound deadener/insulation/undercoat pulled out/scraped off, is in the vicinity of 150 lbs.
A Cyclone GT with 4-speed, manual steering and brakes and no additional options was 3534 lb back in the day.
Admittedly a WAG, but suspect the Comets might have been a tad heavier than similarly equipped Fairlanes of the same model year.
Howie - for track outings you might replace those two La-Z-Boy recliner front seats with something more appropriate, probably pick up a few 10ths right there
Have a safe road trip.