91 CHEVY K1500 4X4 4.3 V6

1991 Chevrolet Silverado • 6 cylinder 4WD Manual • 195,900 miles

I have a 91 chevy silverado k1500 4x4 with a 4.3 v6 manual 5spd. It has 196000 miles is it worth it when it takes a crap to replace with a 5.7/350? And I was wondering if I took 3/4 ton leaf springs would they mount right up with my stock mounts? Oh and the motor revs high how can I fix that. Other than that the motor runs great. Let me know thanks
January 22, 2011.

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