sure its possible, if its a smallblock atleast, if its a bigblock i think you may want to get some fenderwell headers..
one thing to think about here is that there have been some reports about TTI and dougs that fit exelent with a autotransmission seems to have some problems with manual transmission cars.
i have a 73 duster with powersteering and powerbrakes but autotransmission with a smallblock and i have just started building some seriusly stupid sized headers for it myself and i think i can squeze some 2" primarys in there but im not to picky about equal lengts