Totally agree...if you have the money then go for a Zetec turbo lump and aftermarket EFI management i.e megasquirt, Gotech etc but be prepared to replace the clutch and either recondition or replace the gearbox if after mega power.
If not then sensible mods to a rebuilt CVH and either OFAB/OFAC management or aftermarket will see reliable power in excess of 200 bhp easy as long as you have a decent intercooler and turbo.