What headers were these? An old pair of Blackjacks, bought them in 1987. Blackjack is owned by Dynomax now, don't know if the headers are the same anymore.
There is a Ford Racing guy named stan that makes tri y's that fit 65-6 stang .. I got his number from ford motorsports but I forgot it at work.I still haven't bought anything thats a fix though and heddman keeps telling me to hold on so if anyone knows of a sure fit lemmi know.
I just took off a pair of '65 289 heads with the 1.94/1.6 valves that are for sale. Chamber is on the smaller side for a compression boost