V-8 and 6 cylinder radiator core supports are different so to move the radiator to the V-8 position you need to change the support. If you use the sbc long water pump--may have to change pulleys--you will put the fan closer to the radiator. Spacers are also available to push the fan closer to the radiator. Will also have to use longer hoses. The swap is relatively simple and really make your car a pleasure to drive.