Thanks for all your help.
Below is Speeedways response whtn I asked about Ackerman angle:
"The Mustang II spindle should still work pretty good even with a 131” wheel base. The Ackerman angle with the longer wheelbase will hardly be noticed unless you are planning on doing a lot of Autocross racing. It would only effect very tight turns like in a parking lot. In a perfect world the front tie rod when lined up with the ball joint centerline should intersect the center of the rear axle. In order to get the Ackerman correct the tie rod location on the steering arm would have to be moved inboard approximately ¼” but personally I think the stock location will be close enough.
Speedway Motors, Inc.
New Product Development
402-323-3210 ext. 2945"
1) Does anyone know of a part that could be bought, or machined, that would offset the tierod connection to the steering arm inward 1/4" and allow better steering in tight turns?