Not all of us. I recommended staying with the slant six, mainly based on the fact that he is still a teenager, with a limited budget, and very limited experience working on cars. He can gain experience, working with the slant, get the car running, and have some fun with it. Then if he wants more, do the V-8 swap in the future.
I'd agree if he didn't have to pull the six anyways, so I don't see the swap should hinder his decision since either engine he has to do one. If he feels staying with six fills his needs and don't see a v8 swap in his future then I'd say go for it.