The 714 heads on our 90 model Ramcharger are trashed. I have a good set of 302 heads and was wondering if anyone had ever tried running the positive style valve seal used on the 90-92 714's on the earlier 302 casting. I mocked one up and it seems as though it MIGHT work. The outside diameter of the 302 valve guide castings are .012 smaller and .109 taller. Anybody ever try this? Thoughts?