Need some opinions

[Mick65]

I have a 65 fleet side C10. 4 on the floor, 350 engine, cherry bomb exhaust, about 60k miles since rebuild. I was offered a 68 GMC 4x4 as a trade. 350 engine, auto trans, on 35's, unknown mileage. It's a pretty sharp truck. What would you guys do here? Much difference between Chevy and GMC?

Here my CL ad as I was thinking about selling the truck.
http://nashville.craigslist.org/cto/4115992903.html

Here's the GMC
http://louisville.craigslist.org/cto/4157989919.html

What about worth, etc... Or anything else to help me make a decision. Thanks!