single vs duel pipe on 2.8/3.4

[rideharder]

well im running the 83 2.8 as i speak but later down the road im going to do the 3.4 swap . edelbrock intake / carb 4 bl. either headman headers or if i can save up enough the edelbrock headers to match the intake.

my question is.. planing on making a new exhaust and wondering i would like to run duel pipes but unsure on somethings. on a little motor should i run a crossover pipe or true duel. is a cat back duel better than a duel from manifold/headers. im looking for more low to mid torque but will still let it rev out and breath. will run single pipe if needed. waht size pipe should i run with what design.

before and after my swap to the 3.4 i will be running the headers no cat and unknow muffler, posible glasspac.

what design should i fab up. any and all help/ideas will greatly help