351
Ive been racing since the 70s and those early blocks were much better 69-74. Plus if your going to stay with iron heads the 69 - 74 had bigger valves. from 75 up the 351 heads are the same as 302's other than 1/2 bolt holes. Other than a lightning engine those will be best. And they used them in all those big cars LTDs and such so there may be a few left around
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Bill Heiser
90 Convertable 5.0 LX, ported E7s w/ THumper valve job, TFS street, FR 65mm TB, B cam w/1.7 cobra rockers, kirban AFPR, Mac CAI, Mac Headers, off road h, 3 chamber flows, Crane ign. box, 3:73s, Art Carr AOD & 2600 converter
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