Exhaust question

[mrmaxrebo]

I have recently bought a '72 k5 blazer for a dollar.

http://www.cardomain.com/memberpage/825314

She has a rebuilt stock 350. I am planning to get new exhaust from the exhaust manifold on back. What do you recommend for exhaust pipe size. i am debating whether to go true dual exhaust or single. I am planning to get flowmasters or have no muffler at all. i want something with a low tone, and relatively loud, without losing power. what do you guys recommend