you want a turbo car?you want to beat all the local boys?you have 4-700 quid?
may i suggest this?it will MULLER saxos etc and be nicer and faster than any zetec or rst engined mk5 escort you MIGHT finish (been there many times with unfinished projects myself!)
http://cgi.ebay.co.uk/1997-FIAT-COUP...#ht_1023wt_934