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Caps, you won't notice any difference. Might i suggest the parts for an upgrade though. These mads a huge difference in the responsiveness of my stock 350, Hypertec 53K volt coil and with cap and rotor btw, and this HEI module from MSD w/a rev limiter. The difference was immediate.
I bought the same parts at NAPA. The have a brand by the name of ECHLIN which has been around for a long time. They also have a high output coil.
Good Luck
Steve
I would not use any discount parts here. Go genuine Delco or Blue Streak. Delco is available at your GM dealer and O'Rieleys. Blue Streak is available at NAPA, CarQuest, and Advance I believe. May have to order it from the warehouse, but worth the extra $ IMHO.