Well Roger it depends on the weight of your car on the front end, the more static weight, and if you have a front wing putting down pressure on the tires, the more tire pressure you need to support that weight. I would say 40-60lbs of pressure, and make sure you always have vavle stem caps. With wire spoke wheels the stems are in the center of the rim and can depress the valve stem core and let some air out at speed. I don't know if your Weld wheels have a stem in the center.
NTF run 50-60 lbs, and Big Show TF run 80-100 lbs, it's all about keeping the tire from flexing the sidewalls and building heat.
Good Luck with your altered, I assume you are having more fun with your altered than your JF
Jon