360 street car Help

My car is a Dodge Dart Sport 1975, rear end 8 1/4 posi 3.55, now i am trying to get a A-833, tires 255-70-15, i would like to use 95 octanes, 340 port heads 2.02 - 1.60.
I have a lot of doubts of what i need, i would like to now which parts i need to buy because here in Peru the parts are so difficult to import.
So if someone tell me a list of what i need to buy it woult be excellent:
For example:
Pistons, cam and manifold..
thanks