Prices are very subjective and without seeing the car difficult.
But since you asked, in the Southeast the car you are describing is worth at least $14,000 and with work could go up around $25,000+.
Since you bought it new and know about the motor(s), you've got most of the value issues covered.
Check with price guides like Gold Book for ranges, and sales like Hemmings for market.
Of course, some folks on this site will tell you to sell it and restore a 69. But as a 68 owner myself, it sounds like your 67 is well worth a restoration and many years of cruising.
I'm sure there will be plenty of other opinions forthcoming...