Im not arguing with anything you are saying, my point is these are Far from mainstream, in price, practicality, and application. Thats all. I prefer something that more than one dealer in the country has sitting on a shelf. I'd be one thing if these were W9 heads that flowed 390 cfm and required hand made parts, but in reality they are just "exotic" enough to be a pain in the rear, without enough gains over a ported set of regular edelbrocks to be worth it. Imo, which is worth what you are paying for it :) just friendly observations from someone who owns these exact things, and deals with performance parts every day. I bought them once, and wouldn't do it again. Especially with a 4.030 bore, and valve shrouding what it is.