Just a quick post to tell others. Going on a past thread I installed Autolite 104 plugs ( gapped at .055 ) after my mods.
SEVERAL members stated that this may be too cold of a plug. Being the hard head that I am I forged ahead.
To make a long story short, I'm pulling them out this weekend and installing a set of 605'*.
I get cold misfires. While they have not been in long enough to foul they do have a dark grey tint to them after about 500 miles.
They work great when warm. I just can't take the cold weather start up compromise.

Just trying to prevent others from urinating away money for no reason. It pays to listen.
It cost to be a hard head.

JLathem

Sometimes you have to learn the hard way to understand

I would check the 605'* regularly for the first 1000 miles or so and keep an eye on them as well.

Yikes, now I'm getting scared. When I do my pulley in a couple weeks, I will be using 104'*. Should I be worried about the winter coming up?

Your probably all right...

A good rule of thumb is

1 step cooler for 0-6lb boost (.055)
2 step cooler for 6-12lb (.050)
3 step cooler for 12-18lb (.045)