Give www.mooneyes.com a try. There is a section for stickers, magnets, etc... Then select "Nostalgia", there are old speed shop stickers, plus some old dragstrip decals, not sure if there were the particular ones you were looking for, but there are some from So. Cal.
I've come across some of those at car show/swap meets. There was a vendor that had all kinds of them. I bought one of VonEsser's Speed Shop. I used to buy my parts from him in the 60's. He just used to write "Bill's Ford" on the receipt.
One of the best placed I have seen to get reproduction waterslide decals is at DRAGLINK DECALS
I have seen there selection and ordered from them a few times. All there decals are waterslide. Good items and a massive selection. I am into peel and stick so these were perfect.