The dealer is the only place to get the right gasket.
See my "gasket" thread.
You can cut one with a razor out of gasket material.
If you used the gasket that came with the OLD trottle body you bought, """chances""" are you ""might"" have the right gasket.
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I'm sorry I don't have the ability <img src="/forums/images/graemlins/notooth.gif" alt="" />to post a picture of the 2 T.B. gaskets side by side so everybody can see what I'm talking about, and how bad a vacuum leak would be with the gasket 'They All' will sell you nowadays...
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Timing set: there is a plastic plug with a cover on it mounted above you brake vacuum booster on the firewall. One wire-- yellow/white with black sripe(as I recall)-- goes into that plug. You connect a grounging wire(a wire with alligator clips)to the one terminal found inside that plug.
When you connect it your engine idle speed will drop noticably,,,and that's when your use the timing light and turn the distributor to adjust timing.
But,,,If you have a high idle cause by vacuum leak, cause ECU won't default idle to properly for accurate timing set because it's "confused"....