71 midget

Hello all,
I'm new to the list and midgets as well. I just bought a midget 71 model
(basket case). The previous owner ran out of time (a good friend of mine). I
am rebuilding the engine, and noticed that there are alot of "non lead"
parts for the head. This  head is original with  43,000 miles, I am guessing
it was built for a leaded fuel?  So what problems if any will I run into by
using unleaded?  Thanks for any help.

Charlie Shelden

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///  (If they are dupes, this trailer may also catch them.)