Ford used to badge their big cam models (post79) with an installed power so the intercooled engines at 370 badged 350 and 340 badged 320. The pre big cam engines were badged similarly but were slightly lower rated BHP so the intercooled engines were badged 340 and 310. The big chrome FORD letters on the front, if original would put it pre big cam, although many drivers put the old letters on the newer model which came with the blue oval. Any one any wiser? 