You wouldn't want them 'nickel' plated. As eluded to in Tom's post they should be electroplated with copper, nickel and then chromium.
And to be done right for a top notch job the old plating should be stripped off first, then the bare metal buffed.
Would these work?
https://www.summitracing.com/parts/o...EaAn8UEALw_wcB
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/
Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine)
5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE