I have a high mileage 1990 C-10 chevy with a non balance shaft 4.3 engine VIN Z . I would like to put a newer model (1993-1994) 4.3 with a balance shaft VIN Z out of an S-10. Is this possible ? Is it worth the trouble ? How much smoother is the balance shaft motor than the non balance shaft motor ? How bad could the non balance shaft motors have been since they used them for so many years ? Thanks