As you can see with 8850's results even with a 347 3" may be a tad too large. Even many big block Chevys run 2.5 - 3" systems for street use. Racers tend to go with 4" mufflers with big blocks. For a street driven 302 car, stick with 2.5" system with 1 5/8" headers either long tube or shorty.
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Frank W
90 5.0 LX coupe Daily driver. Silencer removed, K&N filter. Flexalite fan, 3 core radiator. FMS flywheel and Clutch, FMS blue wires Energy Suspension end links
88 Notch 2.3L 5 speed Parts/beater car
My two Notchbacks
74 Chevy Laguna Type S-3 305 Finally fixed getting a 454 to put in garage
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