They vary a lot in standards as its down to who put them together.
My mate is a fussy cunt and we did nearly 3 grand on the conversion for his, that included a basic engine rebuild, decent brakes, roose hoses, really good condition 6 speed box, DIS engine etc etc
Or you can throw one together for literally a tenth of that with scrapheap challenge parts.
Done well, they are very good cars IMHO