I was going to get rid of the three vacuum lines coming off the throttle body that are for smog related things. Can I just disconnect those 3 and cap them, or do I need to cap off the other ends such as at the EGR also?
Yup you can. Heres a site that might help click Most people when they do this also just go ahead and remove their egr valve. You can just leave it there though if you wont. there wont really be any negative side effects.
"I wouldn't be teeing the wastegate line off the BOV line, if you are using a "bleed-type" MBC. When the MBC is bleeding off pressure before it opens, it also bleeds off pressure to the top of the BOV, allowing it to leak slightly. If you are going to use the manifold as your wastegate pressure source with a bleedtype MBC, then use a seperate line directly from the manifold."
What port is is a good one to use for the MBC then? Does it matter if its before or after the throttle body?
Thanks for the save I googled and got the WI site lol. Anyway most people try to tap into the intercooler pipe or some turbo compressor covers have a nipple that you can run to the mbc. I know I have seen some 14b jpipes that have them.