try buying the "Rochester Carburetors" book by Doug Roe published by HP Books Amazon or Barnes & Noble usually have them--it has excellent chapter on Monojets so you can desmog them and make them into pretty nice carbs. As far as buying another carb always go with the oldest one as it will generally have a lesser amount of smog technology/voodoo built-in to it. back to the book--try to get the first printing it carries the ISBN number 0-912656-10-7 mine was printed 11/73 it has the most Mono-jet info than the other printing http://www.ebay.com/itm/Rochester-Carburetors-Doug-Roe-1973-book-Quadrajet-Two-Barrels-Monojet-4GC-/201990537354?hash=item2f0793008a:g:24IAAOSw539ZbeT9&vxp=mtr this is the cover of the book you want, NOT the one with the black cover as it has 100 less pages
The '73 edition? Would that cover the '74 to '79 Monojets too? I don't know what running changes they made in them during those years? They were done on the 250 in cars and trucks after '79, but the 292 trucks still used a 210cfm and 250cfm version until '87.
