318 300-350 hp goal : now 323 cu.in

you might be happier with 250 - 275 hp. A 350 hp 318 will need to rev and
that is not too good for lo rpm power.The old 204/214 429 /444 cam will shine here.
Should pull hard from 800 - 4800 rpm.
This one? 5.2L/318 MOPAR SMALL BLOCK LA Camshafts - Hydraulic flat tappet Cam Style - 204 int./214 exh. Duration at 050 inch Lift