I am restoring a 240 z 1972 ground up, acid dipped...
I have noticed a lot of competition parts out there anyone recommending a product they have used for the suspension i.e. struts, springs, sway bars, polyurethane bushings,etc...

 

if you are doing a restoration you would probably want to use as much from teh nissan and nismo catalogues to keep it a bit more authentic, but if youre not worried about that:

urethane bushings from what i have heard do improve the handling of the car, whiteline suspension in australia do a kit.
a lot of people use koni shocks
springs .... well there are tons of options ebachi, king....
with reguard to teh sway bars, you can disconnect the back one to make it handle a bit better ...but i wouldnt reccomend putting a larger one on the back unless you want to slide the tail all the time, you can use a slightly thicker front .. i think 24mm is about the biggest you can go on the front but dont quote me on that...

72 240Z restoring
72 240Z RB25DET Conversion
78 260Z 2+2 Daily Driver

 

Thanks for the info!
BTW, is your 240 z RB25DET conversion right or left hander?

 

right ! im in australia ... its a nearly conversion should be getting the front cut in under 6 mnths ive got the car almost ready

72 240Z restoring
72 240Z RB25DET Conversion
78 260Z 2+2 Daily Driver