12 bolt ?
 

Will a 12 bolt rear end housing from a A-body fit in my 67' Camaro ?

It will not have leaf spring perches. It will have ears on the center sectin for upper link bars (you don't need), and it is 1" wider then a Camaro rear which can be handled by adding backspace to the wheels

Cool ! I was thinking of going with a 4 link setup with coilovers anyway ! Thanks for the info.

If using a 67 or older housing it has the same width as a 67 Camaro, The 68 and up chevelle housing is the same width as a 70 and up camaro....I believe that info is correct. By the way I have a 67 monoleaf 12-bolt for sale, but it is not a good canidate for modifications.....to pricey and it is a traction bar rearend.
A cheaper alternative to modify would be maybe an Impala rearend, they do have bigger brakes, but I would go to ford ends for the axle retention....My.02 cents.

Tommy