Does this prove David Vizard's 128 lsa formula ?

He takes exhaust valve size for calculating primary header tube.
DV never said a narrow LSA is better! You have to choose the right LSA for your engine combo!
My 493 cui with 2.14 intake valve (undervalved) needs a LSA in somewhere 100°, a 340 with 2.02 valves in the 110.
DV is also a detail freak. We all think why should i do a mod for 7 hp? If you are thinking 10 times that way, you lost 70 hp!
Which single mod gives you 70 hp for free?