1977 GMC Sierra Classic 454 C-35 Dually Camper Special 1 ton pickup

Original 454, th400, dana 70 HD 3.73 rear. Dual exhaust with Gibson MWA mufflers and headers. Truck sat for 10 years in heated garage with slide in camper still on it. Truck received many upgrades after it was sold, 454 was cleaned up with headers, new GM performance iron intake, crane cams towing cam, new cloyes timing set and chrome valve covers. The entire driveshaft was rebuilt, new u joints, center carrier bearing and balanced, all 6 tires are just three years old and have plenty of tread life left. Front brakes, mini starter, class 5 hitch, master cylinder, all hoses, carpet, heater core, engine oil cooler, trans cooler and pan were installed around three years ago.Original 4 core radiator and has dual fuel tanks.The paint is terrible, it was repainted in its past and is chipping at certain spots and doesnt shine at all. The underneath is very clean, frame has no rust, bed is pretty clean. A/C has been removed, I will include all of the brackets and hardware
The only rust issues are the front of the hood, bottoms of the doors and fenders and the front cab mount supports are rotted through the floors ( carpet covers the holes). The interior is really clean, original dash has a rip in the speaker grille, features a shift light tachometer. 8 track radio works, new speaker added.You can drive this truck anywhere and all year if you wanted, it tows and hauls very good. 454 has plenty of powerEngine has a slight rattling sound at light throttle, not sure what is the cause of it. Its been like that for the three years I've owned it, never presented itself as an issue.https://www.youtube.com/watch?v=OO_OBnb4TDs