Why did you choose the F-303? It's generally used as a blower cam, although some people have used it N/A and had good luck, the combo I've seen that seems to work well are the GT-40X aluminum heads along with a bigger intake than the Cobra.
Anyway, yeah, I'd say you should make somewhere in the area of 320hp, but I'm not that sure on the Windsor Jr's real performance capacity?
The T5z is rated for 330lb/ft of torque, you may be making a little more than that, but I see no reason it won't take it. I've got one from D&D performance, I love it and no problems. Course I'm stock too.
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