Zetec clearance +2 original Lotus chassis

[c42]

I wonder if anyone could help me out with a measurement please, I am trying to find out how far the top of cam covers on a 1.8 Zetec sit above a standard +2 chassis rail adjacent to the engine mount or alternatively how much the sump sits below the top of the chassis rail also at the engine mount.

Thanks in advance.

Regards

John