Height Off The Gound
 

Hi all
I Have 205x40x17 wheels on the car and was wondering should i have bigger bigger on as the car is sitting approx 65mm off the floor ,I thought i had read somewhere the car should be approx 100 mm off the floor ,any advice please

That does sound a tad low!

Have you got the correct length shocks?
If so you might want to wind up the pre-load.

Ground clearence.
 

Most people with 7 replica's use 125mm front, 150mm rear for road use = chassis to ground.