I am looking to upgrade my stock heads on my 355 small block.

I know that I need 62~64 CC chambers, but how do I determine waht intake runner volume is best.

Is a smaller intake volume better for low end torque and larger runners better for high RPM output?

I will have 9.8-1 compression with an automatic, and will drive mostly on the street with some trips to the dragstrip.

Thanks for the help.

Longer intake runners generally make for better low end torque and shorter runners are better for top end at the expense of low end, but that's oversimplified. The size and shape of the runners matters as well and affects the intake velocity as well and if it's a single or dual-plane intake matters.

You need to decide what kind of driving you do and what you want out of the engine. Call Summit Racing or Jeg's techs and talk it over with them. Give them the right information and they'll give you solid advice you'll be happy with.