1. I did not have holes in my rocker covers
2. I've seen many people with vacuum pumps pull from the manifold
3. Jon Kasse did it on his engine masters 460 (gave me the idea for the second breather location)
4. Wanted to do something different.
Plus, the pressure all comes from the crankcase. The closer you get to it the better you can vent. This was a little detail that I chose to do with the engine apart. If everything was together I wouldn't have bothered and I would have just used a rocker cover. I'm not suggesting that venting from the rocker covers is inadequate, it's plenty efficient. But I'll only be using one source when I use the vacuum pump and I wanted a central location closer to the crankcase. The vent from the fuel pump blockoff is only a temporary until I get a vacuum pump. As most of your hot rods are I'm sure, this is a work in progress.
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