A good friend of mine ran a set of All Pros on a 326 in a 5.5lb. per cube 23 T, one Davinci 850, powerglide, and went 4.85, 142 mph. NA. I thought, "What the hell" and had a set done for my 10.5 lb. per cube 291, and lost a tenth and a half over my iron bowties. Go figure.