Look above the black girl, there's a guy in a t-shirt partially obscured. I think the hairline and ear match the photo of Meat around that age (see
To Hell and Back Again, p. 65). The photo is from a different angle, but I think they match. In 1963 Meat would have been 16.
That's part of a bigger pic. Near the white t-shirt guy are 2 more young men, which would fit w/ Meat's story of being w/ 2 friends.
Thanks for that link Lucy. If you have the autobiography, look at the pic on p. 53. He was not heavy at that age, he's big-boned, but by no means heavy. In any case, I don't think you see enough of the kid in the photo to be able to judge his size.
But then I could be crazy.
T