I'd get it hittin' on all 8 RELIABLY first!

Get a cheapie smallblock electronic distributor (I see them for $5 at swap meets), take it apart, clean the weights and mechanism really well, order Mr. Gasket part #925-B quick advance springs ($11.00 at Autozone last I checked)and get a nylon collar for the bottom from Lowes (the factory ones are either broke or really brittle and ready to break) in the hardware section. Set your reluctor gap with a BRASS feeler gauge at 11 thou and you're ready to go.

The great thing is you can use it either with the chrome/factory ECU box or you can use it with an MSD 6AL box. I like to use the MSD because it has a rev limiter, cleans up the idle and can be bought and most any parts store.

There! Cheap, easy, will get you better dependability and can be used with future upgrades.