89 MGM tune-up

Time for tune-up this weekend and I'm wondering... is it worth the extra 25 bucks to get the Accel 8mm plug wires? Are the Advanced Auto professional 8mm as good as Accel wires? Any suggestions on brand and type of plugs or just go with the suggested type in the manual? And is there anywhere to get a sealed distributor? It looks like mine is open on the bottom and may be getting moisture in it. Thanks in advance! :iceslolan