what manafold are you using?
if a t2 style, find a t25G from a s13 sr20det. These are smallish non ballbearing turbos used on silvias.
If a T3 style find a RB20 ballbearing turbo from a r32 skyling. These are ever so slightly larger than the t25g but spool faster with the ball bearings.
you should be able to find a working version of either turbo for no more than $150. The last three rb20 turbos i bought cost me $50 each.
I fitted the rb20 turbo to my old patrol with sd 33 engine, they had quick spool and held 10psi easy all the way to redline.
With the td27 there might be slighly more lag, if its to much find a smaller turbo, but for the price, these would be the best options to use.
Also, if you go light on the fuel when tunning the car, the turbo will spool later. The trick is getting enough fuel in there for good preformance, but not to much to cause engine damage.
The diesel will prodice more power with more diesel, but will smoke more and if you go to far she will heat up and do damage to a piston or something.
Goodluck