It shouldn't make any difference if its a 248 or a 302 or a 300 or a 450. Back in the 50's I put radiators out of 450's in pickups and ran 228 248 270 and 302. Radiator clearance never was a problem, but keeping cool was. I finally fabricated shrouds and that fixed it. Is it possibly a Chev fan. I have some chev motors laying around that came out of GMC parts trucks and it looks like the fan sticks out farther.
