Well your in the clear considering its a classic car- meaning nothing needs to be restricted.
I would go to a reputable exhaust shop around you- have them weld up a nice 2.5 inch exhaust(nothing bigger than that- its a NA motor and you'll lose back pressure thus loosing HP)
I would run one resonator, just so you dont have a raspy sound but rather a deeper rumble.
And yes throwing in a more aggressive cam does give it a more broken up sound to it a idle as well as more hp- however cams are usually a bitch to install and you need to choose the perfect one for your style of driving.
The whole exhaust welded would cost you anywhere from 300-500 depending on the shop and what company makes your res
Also fuck mufflers- the only people that need mufflers are old people and women