Definetly not do-able with that sorta cash. If you mean decent extractors than $1500 will about cover the extractors alone especially custom ones. I would keep it N/A and just have an ITB setup on it. Tomei make an exquisit set of tuned length extractors for the Ca18de. If you look around on google i came across and fully Tomei built long motor that can be bought from the land of the rising sun revs to around 10,000rpm and pulls some pretty impressive power figures.

For the carbys you would be prolly looking around the figure of nearly a grand brand new for some side draught webbers or dellortos. A custom manifold on that would be exxy as well. I couldnt even put a price on that for you.

Cams around the $700 mark plus the high compression pistons and balancing and blueprinting required. You would be starting to look at figures within the realms of 5 figures. Thats before you even look for a computer for it all.

An NA CA18 are pretty damn cheap but you never know wat the insides are like. I would keep what you have mate and slowly prep the engine before you slot it in to your car. Do it properly and then you only have to do it once. The CA20 is not to be sneezed at either! Its great on fuel and extremely reliable in stock form.

Hope that helps

-Steel