Welcome to the forum! I'm a bit taken back by your mention of the big, fat poly neck on your '79 Strat. Poly yes, but it's it really a fat neck? I also have a '79 and it has the slimmest neck in my Strat collection. I have a friend who also has a '79 and, though it's not quite as thin as mine, it's not what I could describe as fat. For that, I go to the '50's necks (which I love).