The fix is to replace the blower motor with a smaller one. Below is what I used. If you don’t want to do that…. When I first put my 440 with trickflow heads (back before we knew the where taller) we had to grind down on the rocker shaft hold downs. Moved to the smaller motor when I did the body and paint. Was able to move to real cast aluminum valve covers I had so much room
Four Seasons/Trumark 35576