what parts from what cars?

my dad owns a wrecking yard and he has a 83 black 2 dr manual rabbit not a gti. i was wondering if i can make the car faster and better handling with parts from an 84 audi 4000, an 87 jetta carat which is damaged from the front seats froward and a 88 jetta?

the throttle body from the audi will work on the rabbit. the interior and engine should be the same as in the jetta and so on.