Engine Height

[Enoch]

Hi Folks, can anybody tell me how far below the chassis rails the bottom of a pinto sump is on a standard build? I am fitting a 2.0 dohc and MT 75 and intend to use the position of the centre of the diff to determine the height of the engine / box. I am not sure at this point if I need to worry about modding the sump / bellhousing. I have a gut feel that it will give me about 4 - 4 1/2 inches ground clearance at the sump - anyone advise?
Thanks in advance,
Enoch.