The '69 Charger from Revell would be a great start except for one thing, it's a vinyl top car. Since the General is a straight hardtop, the BEST way to build it would be to do what I did and get a Revell '68 Charger 2-in-1 and swap out the bodies with a Revell '69, then use all the other '69 parts for the rest.
NOTE: You will still need to source out a pushbar, decent CB radio, antenna, and decals, but there are resources out there to find those. Good luck!
EDIT: Bad pix, I need to take some better photos without the glare....