I agree with hoggyrubber, old inline hop up books were written for your motor where Leo's books are next generation 250/292s.
I'd start with carburation, duals or single four barrel, then exhaust, HEI distrib or Pertronix. Check out Patrick's website look through his catalog, he's been at this Chevy six hop up biz for decades and runs a great shop, good people and stands behind his products. Best of luck
www.patricksantiquecars.com
