Re: distributor/intake interference question
Valve timing being off a few degrees can show up as you described. By that I mean, having to time by vacuum. Being off as a result of improper installation of timing chain, I don't know. Only timing chain experience is when they have jumped teeth and wouldn't run properly or at all.
Before getting into anything major, have you checked the voltage to your coil? Should be 12V.
Hope I haven't led you on a goose chase.
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