are you thinking of realoldspower.com?
that site seems to work on and off, and the pages load so slow....
As far as heads go, get the large valve K or C code. Here is a link with all the info you need. Check craigslist or ebay, thats where i located my C's.
http://www.442.com/oldsfaq/ofhed.htm
check out www.mondellotwister.com too