Nick, Thanks for responding. I think for now I will just stick with the 8523 on its own. I am looking for bullet proof reliability and good fuel mileage out of this street engine. When it comes to building the 401 for the green Javelin's transformation, I am definitely going to follow yours and Davis' advice. It looks like at this time the 8519 and a 6AL-2 box is the way to go for racing purposes...... Armand _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list