You can also get all the engine brackets off a S10 4.3 engine and they will bolt upto the 350. That way everthing lines up and you get the serpentine setup. Make sure you use the right water pump for your motor. Some of the late model 350's were reverse rotation. Use the same length water pump as the 4.3. I did this on mine and it works good. I bought a junk 4.3 for $50.00 and got that back scrap when I was done.
