its not the surface cut but the chamber/bowl area will need to be widend a bit and those heads are weak there.
(no sense in putting bigger valve in if the heads cant handle the extra flow!!!!
.060 is a big cut!
be prepped to fill a hole or 2 in the water jackets.
do the porting if you must but dont cut the head for bigger valves!!!!
if you can, get Ti all around.
but running them on the intake is ok to a point.
at higher rpms you might get a slight imbalance due to the differing weights of the intake/exhaust valves.
then there is gonna be valve float on the exhaust side due to the weight difference between the two .
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