it all depends on what you want to do/how much you want to spend/how easy you want it to be.
since you already have a bluetop we'll start there.
hang on to the cams, they are better than all the other 16v 4ages.
You will need to get another crank as it is different (any 4age).
you will also need silvertop rods or 4agze rods.
your block is only 3 rib so high power will mean you should probably source something from the higher generations.
from the small port up they had oil squirters in the block also to help with cooling.
pistons from the 4agze will also be required. have seen these used as high as 22psi, came factory to handle 14psi and should see 18psi pretty comfortably.
they come in either 8.0:1 or 8.9:1 8.9:1 are still quite drivable. have even seen 9.4:1 Blue/red top ones used comfortable and 10.5:1?(silvertop) ones used on a really goos tune (I personally wouldnt though)
8.9:1 also provisioned notches for oilsquirters
a tidy 4agze would be the easiest as you can just bolt on the turbo and away you go. I'd be inclined to rebuild it though for reliability which would make the 4agze too expensive for something i could have rebuilt from parts of a 4age.
personally my ideal setup would be go get a small port, rebuild the internals with silvertop rods 8.9:1 pistons, keep the smallport head, run bluetop cams, new ecu, and prob a TD04 or 05 , T3/4 , or vf22? all fairly similar sizes, tried and tested.
This is just what I have come across in my experience, not a definative list. I'm not an expert, just sharing what Ive seen
-O
