You can't find Veloce body kits in NZ, because thankfully they weren't released here.
The Italian Job here in Auckland has a derelict 33 sitting on their yard with Zender kit bits on, although the Zender wheels were stolen months ago. =(
You can also fit the lower bumper extension from a 1.7QV onto the unpainted bumpers of at least a 1.5TI, because I did that with a previous car of mine:
I've fitted my series 2 33 with a sportline steering wheel from Repco. It obscures the dials a teeny bit and makes the steering even heavier when parking, but it gives more room for my knees. ;p
I hear that nothing much you can do to the engine air intake will increase performance significantly. The 1.7 engine comes with larger diameter airbox-to-carb elbows which I guess you could fit, or I've got some bored-out 1.5 ones I don't need. I've heard some people say making a second air entry point on the other side of the airbox helped. Replacing the airbox with separate filters ontop of each carb is acknowledged to bring no performance benefit (it's theoretically worse?) but it adds a lovely noise!
This adds a lovely noise AND allows you to potentially ruin your engine:
I've lowered my 33 and got it wrong - the handling's worse on the track because there's still too much body roll but now (I think) the outside front suspension is compressed past maximum negative camber and back the other way. And the ride's worse on the road, because the shorter rear shocks I had to buy are too firm and the back suspension barely moves. It looks better standing still:
..it squats less and it sometimes feels nippier, but the current configuration otherwise isn't a success. You can't spin it out any more. Here it is in a corner: http://www.axys.co.nz/ben/alfa33/falloffcorner.jpg
I think what I really wanted was my original plan of a rear swaybar, or (for track days) a club member's suggestion of slotted front struts to increase front camber and increased front toe-out to ruin most things except cornering.