Its quite an involved job, if youre going for big power out of it though, you may be better off with a BB 16v turbo conversion. If you arent going to do it yourself you are probably looking at 3k for the conversion; that should cover donor car, rebuild and basic mods.
If you want much over 190-200 brake, id go straight for BB unless you can find a highly modded, decent power, mint donor car for ~3-4k. If you get the right car with good exterior and interior mods or a mint standard exterior you might get 1-2k for the rolling shell.