need a recommendation on exhaust manifolds

[yote1234]

I have a new sp357/350 crate engine in my 1971 k5 4x4 blazer and its exhaust manifold time. im a stock kind of person plus i have heard complaints of headers loosing up. the SP357/350 has vortec heads. so i believe rams horns are not an option. and the new stock cast iron manifolds dont seem to give room for plugs/wires.
with that being said can anyone give me some advice? i would appreciate very much.
Dave