1970 Plymouth duster 340 H code automatic
Just had new carb put on...stock is being rebuild....has new exhaust ... So almost a driver, except the original disc brakes need to be either redone or like some say update to 73 plus
On removing the K/H original discs for the later '73 - up large bolt pattern, keep in mind that you can buy the original K/H parts for reasonable prices (rotors, calipers, pads, hoses, etc.). Check Rock Auto for availability.
By the time you do the '73 - '76 switch you will have a fair amount of money in that conversion, unless you already have the entire setup with all the pieces.
Also keep in mind if you do the conversion, you will spending money on wheels.
Finally, your car is not a /6 or 318 car --- it is a factory 340 car. Converting a non 340 car to LBP is a no brainer. The more you maintain the car towards the original configuration, the more that becomes a selling point.
And if all you are doing is flipping the car, then originality is probably the better selling point.
Just my .02c