Ok what happened???
it ran fine then one day it.......
Or you got done building it up and now it don't run?
new parts aren't always good parts, only time similar was half of the pickup coil in the HEI was bad it seemed. As with a timing light all cylinders would randomly miss. It happened after a intake swap.
Ended up having one built by Dave Ray / AKA IgnitionMan
Kinda like would you buy a Microsoft or Apple computer from a store or get one hand built, programmed and performance tested by Bill Gates or Steve Jobs themselves for about the same price?
http://www.davessmallbodyheis.com/