I can't seem to find much info. Would it be better to have another oil pump on my 71 Z ( from a 280, etc. ) or is stock OK. thank you, timsz

The stock pump is sufficient for a stock lubrication system. If you modify the lube system (for example - change to internally oiled cam, or run both oiled cam AND spray bar), you may wish to you a pump from a 280ZX Turbo.