From what I have gathered on c
From what I have gathered on carb cars being a little richer is better, less chance of a lean condition on the pistons and valves, the rich mixture keeps them cooler, clearly my car is way off though.
Any quality 4 gas analyzer will work, some are better such as the digital computer based models vs the ones that have the old analog needles which are moving about alot when testing and hard to get an accurate reading, the one I have is overkill since it did smog tests as it has many lockout devices and shut down features on it to prevent tampering unless by a Snap On tech.
If you know what you are doing the gas readings can tell all about the health of the engine and its combustion efficency, when I had my 930 checked over for a PPI all the mechanic did was put it on a smog machine as he said it told him the complete health of the engine components such as the compression and valve condition.
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