71 Dodge Dart Swinger in England

Plugs, Reluctor and dizzy Pickup on order from Rock Autos, should be here for weekend.

What plug gap would you run with the HEI fitted?

I'm also think now to check the valve gear, I have good cylinder pressure at 155 across all cylinder but maybe they are not opening fully? bad lifter, valve lash set incorrectly? bent push rod? Probably worth taking covers off and cranking engine over with plugs out, DOH should; have order rocker gaskets too!