This always bugs me. How far do you need it to travel? How long are your steering arms? How many turns lock-to-lock do you want?
When you go to bolt this sucker in make sure the at ride height angle of the steering arms intersects with your suspensions at ride height Instant center otherwise you will have bump steer (If the width is way off you will have bad bump steer).
If you are keeping the steering arms the same figure out a way to measure them and be sure the rack you get is used with similar length arms or be intentional about your difference in relation to the arms on the car you are taking off. If yours are shorter your steering will be quicker/heavier at rest than if yours are longer, you also may need to run stops to keep wheels from rubbing things as the rack may not limit steering angle. If they are longer you may not have enough rack travel and your turns for a given steering angle will be higher.
Again depending on what you do with steering arms you will want to get the front/rear positioning of the rack at a good place for the ackerman built into the steering arms. If it's wrong you may have ill high or low speed behavior. The good news about this is it is a fairly wide margin but still needs considered.
I hope I am just telling you stuff you know an that you'll go.. "Silly Nocones I already knew all that". If this is all news to you please please please read at a minimum Carrol Smith "Tune to win", and Alan Staniforth "Competition Car Suspension". If you want to blow your mind I would read Milliken "Race Car vehicle dynamics" as well.
Now that I scared you the good news is if you know what you are looking for a lot of steering geometry/part location can be of the close enough variety. Since it is one area where the driver has direct control over the suspension and in a corner the outside tire is carrying so much more load due to weight transfer the mess incorrect steering makes is minimized somewhat for the occasional competition car. It most impacts immediate corner entry behavior and quick transitions. This is worth a lot when you are competing for the win but if you are just a occasional user its more important to ensure it's safe and doesn't do anything really weird which I feel you can get pretty close.
Good luck. If you needed front steer I would recomend the Fiero and the MG Midget rack. You could run those if you want to run RHD!
