i used camaro spindles and 80s crown vic upper a-frames on one, it worked great, used some upper a-frame mounts that are sold for asphalt the bolt went straight down into the block and slid in and out to adjust caster/camber
I have impala spindles on my car with a 1/2 ton chevy up ball joint allstar #all56208 and used the #all56206 in the lower control arm. I had to get the upper control arm for the large bolt pattern and weld in a sleeve in the lower control arm to fit the lower ball joint. Also a plus for your roll center the spindles are 1 1/4" taller than a metric spindle and alot tougher. I would have to say it was well worth the time the car seems to turn alot better through the corners.
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