a mk1 multipla would make an excellent sleeper. 16vT from coupe, (20vT would probably fit as well but i understand 16v is easier to wire in and it has a superb history) sort out suspension which should be easy enough as it's based on the superb tipo chasis.
externally, you will need alloys to clear front brakes, especially if using 20vT coupe brembos, but other options don't need so much clearance. will probably sit lower too. but otherwise look standard.
be great fun.:slayer: hmmmm how much are mk1s..... and how much do they weigh?