I have to imagine any dealers south of the border would have tinkered with those Shelbys a bit too. Probably atleast got em up to 289 K-code specs. Ford small blocks really are awesome motors. More compact than SBC and can be built from 255ci to 427ci on factory blocks. My dad bought a 84 Econoline brand new and he could get 20mpg on highway runs out of his 2bbl 302/AOD combo. In a 6300lb van! In 1984!!!Those early Mexican blocks, while still 2-bolt mains, had extra material around the main caps and were a little stronger than the standard factory low deck blocks.... In terms of strength, they were somewhere between the factory standard 2-bolt block and the factory Boss 302 4-bolt main blocks.
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