This is getting way overthought. The BIG problem is reversed Ackerman. Thats the nasty one that you need to avoid. Getting into a big worry over your convergence point being 10" in front of or behind the rear axle is just silly. Now if its 10' in front of the FRONT axle, then you might want to do some adjustments...and you will be HAPPY to get it just in front of or behind the rear axle!
That's my point, there Are so many variables once the tires are loaded in corners, body roll, bump steer, slip angle etc that thinking you have it dialed in is wishful thinking. That only works on a corner at walking speed. 18 degrees outside when the inside is 20 seems to be the most typical setting. There seems to be no correlation of wheelbase to the amount of ackermann in the 50s and 60s. You can find a year model change with 1/4 degree one year and 4 degrees the previous. In racing we often use anti or reverse ackermann to avoid dragging the inside tire. I'd set it a little ahead of the rear end for slow speed, behind for more aggressive driving. Check the toe out on turn settings here; http://oldcarmanualproject.com/books/CarCareGuide/index.html http://chevy.oldcarmanualproject.com/ Great explanation here; http://www.super7thheaven.co.uk/Ackermann_Geometry
Aaaah!, the shining light of reason and thought about the application. Although the thread has brought up some interesting points and facts the fact remains that the OP was asking about a belly tank where the main action does not involve any large amounts of lock (hopefully). Roo
Interesting discussion on Ackerman, Anti- Ackerman, Toe out on turns and track width. But the answer to the OP (considering the above) is, "Don't worry about it."
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