Have a 78 with the 2f. I think it’s been Desmogged as I’ve been looking at some of the vacuum hoses. One thing I noticed is the Pcv valve hose is cut and has a bolt plugging it. The intake manifold where I think the original hose should already has a hose routed which appears to go to the desmoggimg system (holding the hose in the last picture) Any clues why this hooked up this way?