Real deal (Edelbrock) and rip off (Professional Products):
1. Edelbrock: Made in USA, so foundry workers, machinists, and front office personnel put their earnings and tax money back into our economy.
PP: Made in China, so workers' wages stay in China. U.S. consumer money to China supports corrupt regime that, in turn, supports U.S. enemies (North Korea, Iran, etc.). Exploits workers and encourages increasingly stratified Chinese caste system. Contributes to $800,000,000,000 (and growing) annual U.S.-China trade deficit.
2. Edelbrock: Invested in the R & D that created the product; Edelbrock has moral claim to profit from its own ideas; dollars siphoned off by copycat products leaves Edelbrock with fewer dollars for future R & D.
PP: R & D consists of how best to copy others' products, i.e., to make it easier to copy more.
3. Edelbrock: better quality control; core-shifted castings rejected and not shipped; the "little things" are all seen to.
PP: Core-shifted castings shipped; consumer must check and gasket match, or reject castings and try to get money back from retailer. The "little things" are ignored
(Admittedly this last category is the regurgitation of the Edelbrock, and the whole "made in U.S.A." movement's, company line. I don't have first hand data. I didn't even check for gasket match with the PP intake I put on my kids' '65. I have no complaints about it, either.)