I think you have a lean condition due to either vacuumleak (bad flange gasket/cracked hose/s?) or clogged ilde circuit/misadjusted idle screws or a hotter than standard camshaft ( over 225 degrees @ .050").
Check vacuum in manifold with vacuum gauge.
Initial timing is usually set at idle speed, you may check the advance at 2500rpmīs though.
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