Cusser
+1y
If it only smokes at start up, typically the valve stem seals, so if the smoke goes away shortly after, either replace those or ignore it.
Oil ring failure typically delivers smoke most of the time (like mine, before the Oct. 2011 rebuild).
I'd say this has NOTHING to do with the straight 30 wt. engine oil either; I use either straight 40 wt. Valvoline or 30 wt., and have since I bought the '88 in 1994.