Mopar 318 Ignition upgrade

I bought one of the self contained chineseium HEI units from Skip White on Ebay. I have used these in the past and have run them up to 6K+ rpm with only one issue - the shaft seal started weeping allowing oil into the cap. Some guys claim they break up and pop anything over 4K rpm... I have yet to encounter this issue, I put one in this Duster after having used one from skip in a bracket car for 3 years before converting to MSD / pro billet unit due to the shaft seal leak I mentioned. MSD units are far better pieces but the HEI's will get it done for a driver.