A cheap HEI distributor is available from Summit. Part number SUM-850007. I got mine on sale for $149.00 and the regular price is $189.00 If you buy this distributor, install the heavy advance springs that are included in the box. The springs that come on the distributor are too weak and allow the timing to advance too fast causing spark knock.
Another good one is the "ready to run" distributor from MSD.
I heard in California you only have 91 octane premium, so you may have spark knocking problems with the HEI distributors I recommended. So you may want to go to the "DRIVETRAIN STREET" board and ask about HEI distributor recommendations. I heard good things about a poster "Sun Tuned".
See this link:
Sun Tuned thread