Peugeot Carbolite 103 questions

Austin09

Retro Newbie
Hi all I have a Peugeot Carbolite 103 bike from the 70s.

I've just upgraded the wheels to 700c and have started riding it. Next I want to change the pedals or crank.
The original crank is quite heavy and I don't know if they are smaller than modern cranks but the gearing seems quite low.
I'd like to change out the crank for a lightweight unit with cleats. Is this possible and what do I need to buy if so?
 
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