Well, Swap over the Carbs and Inlet Manifold with the TU3s engine (as in Citroen AX GT or other larger peugeots) There fitted with Twin Solex's ] Use the TU3s Camshaft too, With a bit of rejetting you *should* be up for 100Bhp Carburetors in general come in varying sizes for different engine/fueling set ups. But the sizes vary through different makes. The general tuning option is "Webber 40's" Webbers give a lovely throaty sound and great performance throughout the rev range. And spares for a webber are infinate so you can keep your juicy carbs for ever The main problem with fitting carbs (Especialy to a 1.4 pug) is finding the right inlet manifold, Because diferent manafacturers use different stud spacing for there carbs. So to change carb's you'll normally always need a new manifold, or adapter. But on the whole a new set of carbs can bring back alot of life Because if you think of the amount of rubbish thats been floating around in the float bowl and blocking up the jets for 15 years they can't be running efficently now ? If you go with what i've mentioned it might be worth getting the Manifold polished, and the Carbs rebuilt with new jets. Should be cheap and any decent garage will be able to do it What i've said about using the tu3s stuff is your best bet for less than £150, And will keep it useable. Hope this helps a bit ! Jarrod