gear setup for a mid 80s road bike

imperial21

Old School Hero
Hi
I am just crossing over to having a road bike and mountain bike, I have just bought a Raleigh Quassar from about mid 80s.
I want to update the gears to a indexed system, Do people have any suggestions ? The bike is 12 speed, I will be buying the parts used as i need to keep the budget low as posible.
 
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