Here in the Phoenix area cars from 67 to 74 have no visual inspection only sniffer. Hopefully its the same for you, if not, i think only cars with california emmission need a smog pump. I have made my camaro in the past, pass with my holley. Leaning out so much it will barely run. Now i have a Carter 625 i use only for emmisions. I use stock jetting and some metering rods that a local speed shop (Lopers) recommended. I don't know the part number off hand but if you want it i'll look it up. I leave the spring out of the metering rod piston just to make sure it doesn't richen up during the test. The car actually cruises fine, I thought it was going to fail, but it passes every time. I do up the idle on my most radical car to 1100 rpm just to make sure, but don't touch anything else. It has 10.1 compression, solid roller race grind 252/258 @ .050 .630 lift, 106 degree LSA. 36 degree total timing. If this car passes, almost anything should pass. You can probably get a Carter on ebay for under $100. But try it the way it is first, if your lobe seperation is 110 degrees or more it will probably pass. Just turn up the idle. The standards for 68 are not very strict.
67 410sb 11.76 @116.6