quick exhaust question

[mrcomedy104]

i recently got 2.5 inch dual pipe exhaust work done to my 1972 c20. with 2.5 inch cherry bombs. it sounds amazing!!!!! a lot of my friends including my brother told me that i should have gotten X pipes or H pipes done instead. the previous owner of the truck put a 1967 327 motor in the truck, i'm planning on putting a stock 350, or a 383 in it. would the X or H pipes be better for the truck then the dual exhaust i have on it now? they said back pressure is good for the truck