bolting on X-heads to my 340, can i use my exhaust manifolds?

Over the winter I am going to be changing the cam. I picked up a set of complete X heads ready to bolt on. I am running stock exhaust manifolds and don't want to go with headers. Should there be any issues bolting up stock exhaust manifolds w the X heads?
motor has stock heads, a 474 lift purple cam. Eddy performer intake, I am switching to a Weiand (idle to 5000) powerband, holley 670 street avenger, 4spd and 355 sure grip

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