HEI distributors are known to have the module fail. One of the cures suggested is to remove the coil from the cap thus eliminating heat. There are also better coils available, but not in cap. Here is a link to a thread on chevtalk to remove the coil from the cap and use an external coil.
http://www.chevytalk.org/fusionbb/showtopic.php?tid/300403/post/new/#NEWLarry
