68 Hi-Po Questions

[CobraAC]

I have a few questions to ask.. Any help or input would be GREATLY appreciated.. I have a 68 Mustang with a 302 Hi-Po engine.. And my first question is, I have a breather cap on it that has the opening on the side where it looks like a hose should go, does one go there and if so where does it lead to? And I also don't know if this is just a special one in my case or if it happens to mustangs often or not, but I noticed whenever I take sharp right turns or not even real sharp turns but when I turn the wheel to the right, the radio and electrical(headlights) flicker a lot.. I suspect it is a faulty wire, any idea where I should start looking? I'm fairly amateur if you couldn't already tell =) But any help is appreciated.. Thanks a lot!

Jeff