My first truck is a 1949 GMC pick up, and I need ideas

[csc2k5]

I got my truck for $1700, it's in decent shape, but it has no interior, what would you suggest i put in it for seats? I am not putting it back to original. I'm also not sure of what it's sitting on right now, my dad thinks it might be a S-10 frame, if anyone can tell me where, I can get pictures of any specific place that will help ID what it is. I need to know so i can put a gas tank in it. If you wan to know any specifics that might help, please let me know, you'll just be helping me out. I appreciate any and all help i get.