Gee, Brucie Chang's judgemental advice is quite
condescending.........and, by pure luck, correct. Only pinheads worry
if their catalytic converters are "working".
If you want to test for any backpressure from your "bad" converter, just
get a cheapie combo guage (fuel pressure/vacuum) and shove it into the
smog pump hookup on the exhaust manifold. If it reads more than +5 psi
you've got an exhaust restriction, but I doubt it will.
Or you can go buy a new converter, have it installed, and then all
you'll need to worry about is how to pay for it, pinhead.
And, by the way, I live in Detroit and sometimes L.A. If you see a
light-blue, clapped-out and dented '70 Nova with Michigan plates, that's
me. But the 350 motor and Turbo 350 slushbox run freakin' strong,
stronger than my B.O. and my bitch's cuny stank combined.
Happy motoring. See you in Beverly Hills.