340 max camshaft with exhaust manifolds

I would look for a cam with the intake duration and lift you want (225° at .050, .470-480 lift?) , a wide lobe sep angle to cut down on overlap, and about 15 degrees more exhaust duration to crutch the manifolds.
....or, just call a reputable cam company.
...or somebody like Porter Racing Heads, for a recommendation.
(and I like solid cams too)