I have Doug's headers on my 64 Tempest and they fit great. The passenger side is a bit of work to get into the chassis, but once it is in you can get a box wrench on every header bolt. This is an automatic, so check with Doug for the 4 speed fit. You can get a good deal on the headers at Pacific Performance Racing (Ken "Ace" Brewer) at 310-832-4596.
http://www.jimspontiac.homestead.com/Index.html
