Factory roller 360 and 308 head questions.

I think you'll need some port work to see 450hp with the 308 heads, Even the Magnums will need some help at least in the bowls.

The magnums will work with just about any lifter, most have the oil hole all ready.
Just cross check the part number with AMC lifters, If its the same number your good to go as amcs all oil through the push rods.

Most likely you will need a new set of push rods anyways, after the block and heads are decked, Non factory head gaskets and a different cam (base circle) your geometry will need to be measured anyways.

Magnums will need pedestal mount rockers (aka chevy rockers)

and a Magnum intake.