There were 2,819 340 4bbl 4spds built and I'm not sure that I have ever seen a T6 example. Do you have any old pics of it laying around? Do you remember if it had a flat or a rallye hood? If it had the rallye hood, do you remember if it had emblems or decals for the 340 engine callout? do you have the vin # in your records? If you do and you wouldn't mind forwarding it on to me I would pass it along to Berry Washington who has a registry that includes these cars.
Having log in problems when posting, third time's the charm. I don't have the VIN, and my pics disappeared years ago in a dee-vorce. I do know the first 7 were JH23HOE, and the car was equipped as follows:
340/4spd, 3.23 open diff, std. 14" rallyes, ex. tips/valance, T6 dark tan met, black vinyl top, black butt stripe, rallye hood w/o callouts, tinted windows, manual steering, manual drum brakes, A/M radio, std gauges and wheel, std black bucket interior w/console, two spd wipers. Built 10/69.
Other than being a looker, a pretty plain car otherwise. But I loved the thing like no other car I've ever owned. The 340 was scattered by a PO, and when I got it in 1981 it had a 383/4spd with a scorched crank. It still looked nearly new, having been garage kept and pampered most of it's life.
Working as a mechanic at a Dodge dealer at the time, I rebuilt the 383 with a DC Hemi grind cam and springs, ported the heads, added an Eddy intake, 650 AFB, headers, an eight quart pan and windage tray, chrome valve covers from a green '69 383/4spd Dart GTS sitting in our boneyard,{!} threw in a Sure Grip, power disc brakes and power steering {robbed from a loaded Lemon Twist/white gut '72 400 4bbl/4spd Sattelite Sebring, also in our boneyard}
If I'd only known what those straight, complete rust free "parts cars" were gonna be worth. There was a whole boneyard full of cool Mopars. Yep, just kick me. Really hard.