Everyone has great advice!
I agree, if you just want a cheap E-Body, 72-74 will fit the bill.
If 1970 is what your heart desires, then a roller is a great idea but I guess my concern is just that since you're out of the US, I don't know how easy it'll be to source parts to complete your project, especially if $$$ is a consideration.
Would it be a better idea, although more costly, to get a complete running car? Like a base 318 model such as what Ghost mentioned, something with mild modifications (less original) to make the $$$ cheaper but not to far from stock that it has a ton of aftermarket do-dads (modifications)? Just a thought.