Please Help Identify This GMC Medium Duty

[shackattack]

Hello all, I'm new to the forum but have followed it for a few years. I recently purchased a medium duty truck and looking for help identifying my recently acquired late 60s GMC medium duty truck. The vin number is EM5670V C3009E. It has a large V6, single rear dually axle, 4 speed split transmission, butterfly steel hood, one piece windshield. The title reads '67 but no body I have found can decode the vin. I've tried all the local parts stores, local GMC dealers, Jim Carter online to name a few but no luck. I will try to post a few picks but not sure if I will have success. Any help would be greatly appreciated in identifying my old heavy hauler.

Thanks,
Wiley
San Diego CA