Options For A 1.8 8v Motor

[Richie-Van-GTi 72 2 Cars]

Ive just purchased a new daily hack in the form of a 405 estate 1.8 8v. My main plan was to swap it for a TD lump from a 406 but given current derv prices against petrol and the fact it just done me 260 miles on £20 of petty Im thinking maybe just give the current motor a bit more poke? Not after anything fantastic and not looking to spend a great sum, I work in a scrappy so parts access is good. Hoping someone will say drop a 16v head on and such and such management will work and plug straight in

[Sandy 191]

Hmmm, probably not! That's pretty bloody good economy.