I agree for your motor size the heads aren't going to give you much if any (you will lose some bottom end with the bigger heads) especially if your motor isn't a real high rever but by going to a solid roller and keeping your ovals you will effectively increase your air flow dramatically. This is because the solid roller is able to run both the spring pressure and have the lifter follow the cam profile exactly as to allow the ramp angles of the solid roller to be much steeper which will mean the valve comes off the seat, opens fully, and returns to the seat in a much quicker and efficient manner. The time the valve is open at peak lift is longer than with a tradditional flat tappet cam. This is your best bet but remember it is the total combo that makes power not just good mix matched parts.
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