You won't get by the visual.
It would pass the sniffer on the dyno if you found someone to to it.
I put my old notch on the sniffer to see.....
W/ long tubes..(No EO#)
no smog pump and no cats....
At idle it was bad...400 ppm HC and 2.02 % CO
But at 2 grand...it went down to 90 PPM
and .25 % CO
W/ cats it would have been no problem.
A Clean pipe test(different car, your vin) runs about $400 if you know people.
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'88 coupe...stock as a rock.
Check out
http://www.burnouts.stangnet.com
11's coming soon!!!!
Heads,intake and cam are all here