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My take on smoking engines is, if they sit for a period of time they are going to smoke upon startup. Even though the tolerances on my race motor is dead on factory specs, it smokes upon initial startup. That is the nature of internal combustion engines, especially if the specs are a bit larger...

First things first, get a good tune up on it, get the timing in it's sweet spot and delve into tuning the carburetor. From there, give us a much information as you have, IE carb type and size, daily driver or weekend car. The more info you give us, the better we can help you out.

From the looks of the plug pictured, it's a fat pig. DO NOT richen it up any, lean it down some. When they "tuned" the carburetor, what exactly did they do? If the car sat for a long period before you acquired it, it may take a bit of run time for the rings to reseat in the cylinder bores.

Harbor freight has a decent inexpensive dial back timing light.

I worked at a speed parts store years ago & they did nitrous refills. He had a scale only for nitrous refills & he had it calibrated & certified once a year. He made a LOT of money with refills because he was honest. These days, everyone is out for the bucks & don't care if they screw over...

Definitely rich, time to delve into the carb & find the problem.

The Frantz by pass system came out in the fifties. It is just like a lot of other things advertised, "SNAKE OIL". Using a top of the line oil & air filter will add many miles to your toy. Keeping it tuned & changing the vital fluids on regular intervals, as needed will also add miles to it...

We built an RX7 with a mild 340/727 & 8 3/4 combo back in the late 70's or early 80's. It was a street screamer & a drag strip nightmare. We had a lot of fun with it until we sold it and the buyer put two stages of NOs in it & proceeded to wrap it around a tree. I wish I had the space to try...

The running on, or dieseling might also be caused by too much advance on the timing. You might post what your initial and total timing is. Bill S.