In your case I would go manual rack, espercially if you run skinnies up front with a lot of air pressure in them. If your caster is minimal, it should steer fairly easy.
The rack I bought was 19.75 inner tie rod end to inner tie rod end. It worked out real close, but came up a touch wide, and I am going to have to use rod ends rather than MII stock rod ends (which happen to fit the Mopar steering arms). You have a choice between a Mustang II rack or a pinto rack. The MII rack is stronger, but I went with a Pinto rack as my car is lighter than most and it is easier to fab up mounts using that plate on the K frame as a mounting surface.
By switching the lower ball joints side to side, cutting off the steering arm , then shortening it and resetting the angle, it can be made to work. Some will say it is not safe to weld cast steel, but mine came out strong as original. You also have the option of a custom lower steering arm, made to bolt to the inner side of the balljoint using longer bolts. To retain turning radius, the factory travel stop on the lower control arm needs to be trimmed when adding the extra width with a custom steering arm. If the lower control arms are the same length as mine, the the 19.75 rack ought to get you there, but may lose ackerman angle. My drag car has zero, which works at the strip, but does scrub tires on a sharp turn. If you get some ackerman in it, say 50 percent or more of stock, I would run it that way rather than comprimise bump steer. I have found that my drag car recovers from getting crossed up at speed very well, compared to a stock front suspension because the front doesn't toe out when trying to counter steer. I beleive that kept my off my lid more than once. I am going to leave that plate as large as possible to keep the K frame very ridgid, and use a truck pan for clearance.
Last edited by gregsdart; 03/02/14 11:03 AM.