What is the dimension to the ground from the centre of the lower front cross tube on the crosshead? What is the dimension from the lower chassis rail to the ground at a set point and what is the ground clearance under the sump?
Any 80's or 90's las 8 will do.
I will do the cross head to ground and chassis cross member to ground measurements tomorrow (please forgive the delay I have just tucked into a good bottle of red with the missus , and don't think I want to go and get grotty under the car right now) . I expect you realise that the sump is not the low point under the car , it is the gearbox cross member. Where do you want the chassis to ground to be measured from, normally the chassis is pretty much level and so the measurement from the bottom of the Z-section to ground should be pretty similar wherever it is taken I think.
Race cars used to mount the cross head higher in the chassis rail to reduce the ground clearance, If it seems too low , this may be the reason. Does the "cheek" of the frame front sit level on the bottom chassis rail , or is it moved up a few cms?