He is correct ot what i have seen as well... I forget you are a 351w that actually makes a big difference...... The biggest I have run in recent years off the top of my head witout custom notches is..
Ad dur @.50 lift
284° IN 220° IN .540" IN
296° EX 228° EX .540" EX
on 110° centers and installed -4°.
I still had room to go on that one too.
PS I usually do my checking with the cam retarded becasue if it is goign to be an issue then retarding will show it up first, and then you don't have to worry if ytou awant to change your cam timing later.
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A good plan, violently executed now, is better than a perfect plan next week.
George S. Patton, General (1885-1945)
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