Join a local Cobra Club, this is your BEST resource and you can get first-hand experience, maybe even help someone else with their build.
I highly recommend against using donor:
> master cylinder (been there done that, replaced it in less than 3 months after licensing)
> power steering rack
> brake calipers
> radiator
> fuel tank, pump, and sending unit
> wiring
all of these items are going to be 20-ish years old and probably past their life-span. Some would be a Major PITA to replace after the body is on (Wiring!! radiator, master cylinder, fuel tank, etc)
were you planning a Base-kit or Complete-kit?