Hey guys, im switching out my carb from an old holley 4130 econo something other that came on my 85 firebird. (upgrading to a street demon 625) I could do the regular swap carbs and be good, but thats not me. I took the carb off, saw that super dirty not taken care of intake manifold and knew i had to take that off to clean it. the guy before me that i bought the car from didnt take care of the car so well as he said, black coolant, jerry rigged wiring, oil gunk under the valve covers to just name a few things... the carb had some vacuum lined choke that had vacuum lines going every which way. anyway, im trying to clean up the inside of the engine bay and taking out anything unnecessary. I live in arizona and where im at they dont do emissions or anything... as long as it has headlights, mirrors and blinkers its good lol. in the picture i posted with this there is a big unit on the left side of he picture right behind the alternator, a little to the left. what the heck is that. it has a bunch of tubes going every which way and makes the inside of my engine bay a complete mess. now im not a super big motor head, i cant tell you what cam i have or the gear ratios or anything like that... but i probably do know a little more than the average joe. i feel stupid for asking, but is that thing needed? the charcoal canister is already out as well...also, is that an egr valve next to the carb? is that thing needed? i heard some people take the egr valve out and put a bypass... anywho, let me know what you guys think... if i need a better picture let me know lol.