[mr48chev]

The good and the bad, a six cylinder radiator mounts a few inches (the TF guys will have to say how many) in front of where the V8 radiator sat. I'm thinking that there is a stamped sheet metal spacer that moves the V8 radiator back. At any rate that gives you all the room you want for just about as big a fan as you want and plenty of room for a clutch fan. It also gives you a little wiggle room in your favor to mount the engine and trans. I'd figure in enough room to clear the HEI if you are running an HEI, If memory serves right with the engine in the stock V8 position there isn't much room for an HEI in front of the firewall. My 57 panel was a V8 swap into a six cylinder truck using the cast iron V8 bellhousing and 3 speed from the six.