If you look at the picture ,you can see the spacing is very close. I decided to go to a roller rocker. With the stock Ford pushrod, they were pushing on the outside of the valve stem. By using an adjustable pushrod, I was able to determine the length of what I needed by using the method on the site that Bob directed me to. It turns out, I had to go to a 6.5 length pushrod. I suspect that when the heads were done, they cut the valve stems too short.
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