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Might want to try the factory 440 Magnum cam, but you will need to close the lobe center down to 109. Dual pattern cam grind and will pull to 5500 even at 109 lobe center. there may be other newer stuff out there but your not trying to break any records. grinding cams for 45 years, you will not...
More duration will kill the bottom end, more lift will increase torque. Nothing bigger that the factory 340 hp cam. advance it 2 degrees for even more torque.
If the block is grooved the oil will find the hole, that being said oil holes in grooved blocks should be installed with the cam bearing oil hole down towards the pan. The reason is valve spring pressure pushes the cam down creating more clearance on the top of the cam. If the oil hole is up it...
camshaft has been parkerized, an acid etch process designed to hold oil during the initial break in process. all cast iron cams should be parkerized. I know some early purple shafts were not, not a good idea with today's oils