I'm building a book chasis 4 inches wider than standard. I intend to use cortina uprights with standard wishbones and an escort quick rack.

Will the wider chasis mean that I'll have trouble setting up the steering geometry to avoid bump steer?
Should I try and use a wider rack to start with so that the track rod ends dont need to be so long?

Thanks,
Sammy

Should be fine as long as you don't use a Cortina rack.
In an as per book build the book escort rack is too wide between the balljoints on the rack for the book chassis.

Why not a cortina rack. My Formula27 uses one and it is just the right length with no extensions.

I also know the whereabouts of a recon quickrack for about £45.00. I was offered it but had already ordered a new one.

i dont know about cortina racks, but in my experience, the escort rack is too long for a normal car, so a +4 is more suited to it. Sierra is even longer i believe. So long as you get all the knuckles lined up as well as you can you should be ok.

Escort rack is just about perfect for a +4" chassis, though it will need some short extensions.

The cortina rack isn't very suitable for a 4" chassis, the splined shaft is just about perfectly in-line with the FU chassis member so numerous UJ's would be needed. It's too long to give good bump steer performance anyway.

If you use an escort set-up for your inner brackets and place a cortina/taunus steering-rack you will have bump-steer.

The inner ball-joints of the cortina are much wider.
It could, but you have to recalculate the place of the brackets and steering-rack. It could result in weird angles.