i have a 87 350tpi iroc. i need a set of headers that have no emmisions tubes and it has to have an o2 bung and also preferably extra length in the y pipe to replace to cat or ill just use a test pipe. what parts do you suggest. i read all the stickys and cant decide o and ill be installing them at the same time as the new motor hopefully as soon as i get them in. please give me some parts numbers