Do what Martin says above about taking careful measurements and ordering an aluminum one off eBay for ~$130-150 or so. If it were me, I would put on a 7 blade fan with clutch off a 350 or 454, that way the fan stalls out when it is not needed (cool enough engine).
ken
1959 NAPCO 1/2T 4x4, 1960 GMC K20, 1960 GMC K10 Suburban, 1962 Chev K10, 1964 GMC K10 Suburban, 1966 K50 wrecker
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