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burb
I think the 4.3 would get worse milage because the motor doesnt put out enough power for a 6500lb truck. other than that the swap should be strait forward. the 4.3 is a 350 with two cylinders lopped off. if I am not mistaken the motor mounts are in the same spot.
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67' Chev swb step side
69' SS elky
03' Chev ext cab 4X4
hey who lernt me to spell 
 is there anything else?
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