Thanks for the help all. I'm still reading/researching, trying to decide.
Quote:
Originally Posted by cleszkie
I would start by looking at your electrical system before I went and threw money at a new dizzy. HEI ignition modules do not like low voltage at all. Either intermittent or sustained low voltage. Low voltage will kill modules all day long. So check that you are not using the factory resistance wire for power, and check that you are providing your HEI a clean 12V source that does not fluctuate when electric fans kick on, or other power accessories are turned on. The best bet to get a clean 12V source is to tap directly into the battery, and use a relay with keyed power to close the circuit between the battery and HEI.
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I have gone through the electrical system and I have never found a low voltage situation. When I switched to HEI I ran a new wire to the fuse panel to the unfused ignition terminal. I was running the stock externally regulated alternator. With the engine swap I switched to an internally regulated alternator and it seems to be charging fine. I tested output and it fine, and the gauge is working. So keeping an eye on it while driving says it is doing its job. I have also checked voltage at the dizzy and it has always been at least 12v.