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I plan on puting a 1968 thunderjet 429 from a thunderbird
into my 1980 F150 4by4 that curently has 351m. I believe
i have details worked out -rear sump pan-frame mounts from
f250 460 truck-
some one told me that older 429 blocks were driled diferently
where the ruber mounts bolt up.than later 429-460 blocks
Does any one know if this is true?