so i found out that its really not necessary, there was a gasket there, the new one didn't come with it. i thought it was necessary as there was a vacuum thingamabobber attached it to. but the new and old cap both have a vent port on top. so i think the gasket was simply placed there back in the day to try and keep crud and water out.
i went to oreillys and found an o-ring out of some sort of chevy oil cooler kit. its a round o-ring as compared to the flat rubber gasket that was there before, but it fits, just a bit of a stretch on the clamps that hold the dizzy cap on. i'll see if it does in fact do anything.
i also found that some toyota guys that like to submerge their trucks use silicone to help water proof the dizzy. i may try that out if this car turns into an off roadin rig.
thanks for the replies.
bright