Opposite to your Phony assumption the 4A-G is a duplicate with the Cosworth BDA, (coincidental ‘A’ series designation on both engines). You'll find tiny, if any, interchangeable areas amongst the two engines, beyond perhaps some nuts and bolts. The Cosworth 4-valve style started off existence utilizing the Ford Cortina engine https://saulo058acc7.eqnextwiki.com/user