upgrade to a pertronix,or contact langdons stovebolt engine co.,He has a hei that is a bolt in. They are both about the same cost, however, if the pertronix breaks down, you may have a hard time finding a new module right away. If an HEI breaks , any auto store should have the module in stock.
For your info I have pertronix on my 261 and have run it for 5 yrs no problems.
