Hi Guys ,
Just an old A&P mechnic here that sells software for a living....
Go To:
www.sandersonheaders.com and link over to the technical stuff. The discussion there put the old wives tale to bed with a very good set of back up information by Tony Garisto, Owner of Sanderson Headers. The discussion and charts are the old argument of Small tube vs. Large Tube headers, and a lot more.
I firmly believe modern automotive technology is the right answer and the only way to get it is go to the experts.
Best Regards,
Tony R.