What stall and gears do you plan on running, vehicle weight? I imagine it weighs ~4000#. 600hp is easily doable with a stroker. I sourced my rotating assembly from Coast High Performance. If you are set on the 4.5 inch stroke I would definitely use the TFS heads, a nice mild solid roller (displacement directly effects cam size) and a dual plane intake would make for a extremely torquey monster. If you can do a .030" overbore I don't see any reason to go with an .080" overbore. For your intended purpose the gains will be almost unnoticeable and you would effectively make that the last overbore on the block. I wouldn't bore the block any more than necasarry to clean up the bores.