if you have a Webber with the three rev mixtures I would try turning your idle up, if that fixes it lean the lower rev mixtures
if the popping's coming from the exhaust, then it's too rich, but if it's backfiring out the carb it's too lean. The other easy way to tell is smell you exhaust (not too close) smells like fuel (too rich) makes eyes water (way too rich) smells like a hot BBQ (pretty much right) really hot and dry (a little lean)
Personally if it was me I would just check your timing (if you have a timinig light) and your points (clean and adjust)
the other way is to pull the plugs out and check what colour they are
_________________ -doing a Degree in Mechanical Engineering,
and a few conversions:
13B Extend in a 1600
4EFTE in a mini ute (all slowly)
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