[Enoch]

Aside from the tank sticker you need to be very careful with all the parts on this car. Many of them will help document this as a 435 car. The under dash harness and ignition harness will be spliced in a way to prove it had transistor ignition. Don't throw the old ones out. If its still the original nose on the car the left front fender skirt will have three holes for the transistor ignition amplifier. The front sway bar will be thicker than a standard small clock. The speedometer gear cluster will have a two letter designation sticker on it and a date stamp proving that it was a 6500 rpm tach and the date it was produced check the tag on the transmission if its still in there it's a very hard to find transmission check to see if it has f41 suspension also small blocks in 69 did not come with f41 suspension. But not all big box had F 41. Only big blocks in 69 had rear sway bars. Look for the original rear sway bar and attaching hardware.
I've had a few customers that have removed the tanks from the cars left the tank sticker on the tank and build a box with a plexi glass top to store the tank in.