The P heads have a angle that the normal GT40 heads do not have. I used them on my 91 notch with special shorty headers from Central Coast Mustangs, I use to work there. I also switched to long tubes and the headers work fine but there was more effort to get sparkplugs in and tightened down. The answer to your question is yes but you may have to do some clearancing on the Tri-Ys to get the plug wires to sit correctly... That's just my two cents...