Seats Question - need quick answer if possible

[Dustydog]

I have a 1970 GMC Shortbed. I am 6'3" and my son is 6'6".
I am going to a local junk yard tomorrow to find seats for my truck. I want them to look nice but I also want to gain as much room in the cab as I possibly can. I see some from later model trucks that seem to look good but wonder if they take up too much room?

Any quick suggestions would really be appreciated.

Thanks,
Dusty