New to Website; Tire/Wheel Size Question

[wd 69]

Hello! New to the website and I have a question. I have a chance to restore a '69 C10 LWB which has been in the family since brand new. My question is this: What is the largest wheel and tire size I can put under a stock suspension?
I don't want to go crazy, but I want it to sit up just a little. Just a little. Any photos out there of a good combination? At the risk of alienating everybody here, I just do not like a pickup truck lowered at all! Every time I try and search this information out on the forum, it always seems to come back to lower or dropped trucks. . . I realize I must be in a minority, but does anybody have any info regarding stock height, but larger tires and/or wheels? Thanks!