Do you want flat tappet or roller? Do you want hyd or roller?
Personally I like roller cams. Remember that roller cams bring you into the power curve sooner and keeps you there longer than a flat tappet cam.
Also wait till you get the heads on (with your rockers) and the cam you want in the block. Then measure to get the correct Pushrod length.
MRL produced an engine at made 470hp and 410(?)TQ. Might wanna talk with him.