Actually, LMC specifies the same radiator for all but the 230 on the later Chevy models. Given that a six is significantly longer than an eight, it only makes sense that the shrouds would be very different. I can't believe you need an 8" fan spacer for a V-8!
My '65 has no shroud, and the original 230 radiator...no wonder the 250 runs hot! I put on a big-blade flex fan, and use a 1" spacer so the fan is <3/4" from the radiator.
Now I'm curious...
