Nova headers?
 

Ive been on the lookout for headers on craigslist and found a set here from a 74 nova http://dallas.craigslist.org/ftw/pts/2134829321.html. I have searched and found that nova headers will fit our trucks but my question is will the full length(im assuming that is what those in the ad are) fit or is it mid or shortys for a nova that fit? Also what is that connected to the collector? A sensor of some sort?