1975 Sprint Veloce - Upgrade Assistance

I just got hold of a 1975 Sprint Veloce and want to upgrade it with a plug and play type of conversion (New performance Barrel, carb, elec ignition, exhaust, clutch, gearing etc. I've been surfing sip's lists of items but not sure what to get. I'm in South Africa, therefore when I order it should be the correct items as a return will be costly. If someone can assist me with some sip part recommendations it will be highly appreciated. I’m in the woods at this stage. Thanks Confused