The man wants MORE caster. How about this idea?

HemiDenny said

for the most part they are.....EXCEPT the OEM small ball joint / 4" bolt circle drum brake spindle where the top is offset to the front.

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But we're talking about '73+ disk spindles that are symmetric and can be swapped side for side without changing anything other than the position of the caliper.

Garrett Ellison said

Thank You for the pictures of the modifications on the trans am control arms. I wonder if the 1972-1993 D or B Series (truck or van) UCS’s would be a good starting point for a modified setup.

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The Chrysler Kit cars had a D300 spindle option...

"D300 truck front wheel spindles with larger wheel bearings, front disc brakes with 3.10" dia. pistons."