Help Identify GMC

[Newby 69 GMC]

I just the truck pictured below and I know very little about it or GMs in general.

What I know (I think)

It is a 69 GMC
It has a 350 engine
It has rusted out trailing arms
It has no brakes
It has an automatic transmision

I come from a long line of Ford people and this truck was my wifes grandfather's, and he passed awy last year. Nobody in the family really knows much about it and I know even less.

It is not at my house yet and I am going to get the model # when I can.

The fender badges are wrong I have been told. They say GMC 920.

Any info that you experts can give me from the picture below would be greatly appreciated.

Thanks