i know this conversation is old now but if it helps iv had this problem with trying to drift my Z but i have been talking to someone from drift works and here is what he said...
Hi Alex,
You need a set of Tein tie rods with the spacers, the rod ends won't fit your 300ZX but the rods will and that'll give you about the maximum rack travel possible. :)
http://www.driftworks.com/catalog/products/tein-tie-rods-and-ends-nissan-fitment.html
Along with ditching the standard restrictive locking plates that should improve matters, then you need to take a look at the stock lockstops on the lower arms. Cutting them down will also help improve your lock, the ideal solution is to cut them off all together then bolt or weld on thin steel plate of the exact thickness to limit lock before the tie rods go "over center". :)
If you need some advise on how to modify your arms, ask on DW, it's the same front end as R32 Skylines and the modifications for lock count for everything including 200SXs, so plenty of advise on there!
Cheers,
Ben Broke-Smith
Sales Manager
Driftworks Ltd.
phone: +44(0)845 869 2555
fax: +44(0)845 127 4019
http://www.driftworks.com
http://www.hsdcoilovers.com