i know the gt40 heads would fit on my block but wasn't sure of the valve covers...i actually have ford racing valve covers but they fit my 1992 stock heads...
I had to do some grinding to my valve covers to get my roller rockers to clear. And had to grind down the baffle on the pass side and fab up a new one when I put my P heads and 1.6 RRs on. Some guys have had luck with stacking two valve cover gaskets and that gets them enough room so they don't have to grind