Tire and RIm question on a C-20

[truck69]

I have a 1969 chevy custom camper that I got a last year. They have the orginal 16 size tire on the truck. I went to Belle Tire yesterday to get some Eagle 58 series rims which are already in but not on the truck yet. I told my brother (who lives in a city near by) that I got the rims and he asked me why didnt I get wider rims and new tires? The rims are 16 x 8. This might be a stupid question but how much of a difference would it make putting bigger rims on it and getting the grandpa tires off and putting bigger ones on? I have a 350 engine in it but its no hot rod. ANy ideas would be great.


Thanks. Truck69