I looked at a starlet steering rack and they are close width wise and I think they could be made to work pretty well as they are only slightly wider than the distance between the bottom arm pivots. That means if you could get it the right place (assuming your motor isn't in the way of the ideal position you'd probably get a little bit of toe out bump steer, I obviously couldn't tell you how much though, not with out drawing it all up way of the ideal position
The other one I wanted to look at was a mini rack they have an excellent steering ratio but i wanted to check how long the steering arms were compared to the 1200 ones because a mini with 165's on it was hard work to turn with a little steering wheel.
one of the usa racers on this site uses a mini steering rack in his race coupe, i can't remember his name though, maybe bob i think.