In regards to the radiator for the intercooler I dont think it would would work because in an intercooler there is little fins on the inside of the tubes (just like on the out side) to cool the air passing through, and a radiator doesnt have them on the inside.

I have set up two turbo a12's now and through experience I would recomend......

- running some sort of intercooler, even a small one is a help

- To box in the carby, I have seen some other set up's where the carby's havent been boxed in and they have given trouble. With the carby boxed in you dont have to worry about gaskets or seals leaking.Just make sure the carby is running well in the first place. Oh and I found that running 110's for the primary jets and 200's for the secondary's worked the best for me.

- the single diahtsu turbo I found worked well, it was very torquy around town.
The twin set up had more up top.
I would recomend a turbo from a jap wrecker of about the same size as a T2 off a pulsar. Maby in our cases when I guess money is an object it is a bit of a case of suck it and see.( for want of a better phrase)

- I used an electric fuel pump with a regulator and discarded the mechanical fuel pump. Then had a pressure switch on the manifold so as when boost reached a set pressure the regulator would get bypassed and the fuel pressure jumped to 14 psi this worked very well

- also for starters I recon a standard engine would be good. I would hate to see you blow an expencive engine up, and as was said before it is very hard not to screw up the boost