Tony,
What kind of gears and tranny are you running? I suggest a tire that will give you a total circumferance of 26.5 to 28 on a 350 SB. I would go with the smaller size for a smaller SB for performance.
Do I know you from some where?
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Gerardo
1983 Custom Truck
TX Plates: "BAD BOW"
http://www.geocities.com/abetterchemist/