I got the converted hei off ebay. I had to custumize the firewall alittle to install it. It fits in very well. It fired right up when I turned the ignition. Although mine was a home made hei converted distibutor you can purchase them new at davis unified ignition or (DUI) for any make or engine including ford. I like the performance and simplicity of the hei's. I just took the truck out for a run after relacing the springs and weights and ended up getting rid of the pinging by setting the initial timming at 5 degees and ended up with total advance of 42 with no pinging. As you suggested I will try a adjustable vacume advance. Thanks for the reply.