http://www.jegs.com/i/Offenhauser/750/5970/10002/-1 here is a link to jegs. they have the manifold for the 1970 and later 170/ 200 / 250 ford. the earlier model sixes with the small log use a different part number. i am not sure if they are even available new anymore ,they show up on ebay from time to time. if you are going to go this route I would use the 1977 or later head. you get larger intake valves hardened seats and a larger intake log volume. you will have to mill the late model head, the combustion chambers are about 10 ccs larger than the 66. the jegs ad says to use 74 or earlier stock carbs but you can also use weber 34 ich or ict carbs.(EDIT) try clifford inlines also.the pic of the offy they show is for the small log head. http://cliffordperformance.net/
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