Converted my AC to R134a this weekend. Worked fine. Used the Wal-Mart kit + a pressure meter. It cools as well as it did before w/ R-12.
Also, found I was running too lean, adjusted Idle on the Ebrock 1405 richer (two full turns out) and it runs much cooler. Also, the timing was a TDC, and I pushed it out to 10 BTDC. Wow, what a difference in performance.
Now I've got AC again, it does not overheat (well a little, but a shroud ought to take care of that) and lots o' ponies. Fun Fun!! /forums/images/icons/smile.gif