check out
www.wabba.net site for the cleavor (cleveland heads on windsor) info and parts. You're better off with more modern design heads, alum if you can afford for weight. check oemfordparts.com for ford GT-40 alum heads / prices. cleavor manifolds expensive. also not the best street engine, too large ports and valves, and inefficient combustion chambers compared to any modern head (no quench on 2bbl and on open chamber 4bbl heads, only on closed chamber 4bbl heads - rare - and4bbl heads are WAY too big for any decent street rpm range throttle response. even stock pre-67 (before smog air bump in exhaust ports) 289/302 heads with next size larger valves with pocket cleanup and port match better.