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My 302 is smaller, so I don't know, I think your's is 3" but, here's some math.
circumference = (2) X (3.14*) X (Radius)
With a little magic we can come to the conclusion that:
Circumerence divided by (3.14 X 2) = Radius
Radius times 2 = diameter.
You can measure the circumferance by wraping a string around the pipe and measuring the length of that sting with a ruler.
* 3.14 is pie.
Primary rig is Green Thunder:
95' F-150 XLT 4x4, 302, 5 spd, MSD 6A, Flowmaster American Thunder Exhaust, Sunroof, Clear corners w/ Diamond headlights, CD player with 2 10" subs and some 32" BFG Muds .
That's it for mods now, saving for a Stang. Check out my Gallery for a look-see.