i have a 90' sapphire cosworth replica > with a ridiculously mint body shell & interior ! but is fitted with a nasty oil burner of a 1.8 CVH >

i need somebody iwth some experience / knowledge to point me in the right direction as what to do with the power-plant e.g

what could be wrong with the cvh > burning oil "heavy smoke" above 4000rpm ! > is it worth fixing ?

zetec conversion > 1.8 / 2.0 zetec > even the i4 RS2000 engine > has this been done b4 ? and if so how hard of a job is it > prices etc... i've seen zetec's in fiesta's / escort's but never in a sierra !

an RS turbo engine ! > is this a direct replacement ? what difficulty's will i heave with the loom > and petrol tank etc ???

a large capacity 2.8 / 2.9 ? xr4x4 > is it feasable to convert to 4wd ? is this cost effective and a simple job?

i'm on a tight budget > but it's such a shame to let this car down with a nasty engine !

"cosworth is a NO NO" > insurance & cost put a stop to that !

any help / info / parts offered ... much apprecaited ! cheeRS simon