You don't need new rocker arms if you convert to screw-in studs. The portion of the stud that the rocker ball fits over is 7/16". The stock studs neck down to 3/8" while screw-in studs are straight 7/16" but that won't matter to your rocker arms. Biggest difference is that you can't just torque the rocker nuts down to 20 ft-lbs and go. You either need poly locks or locking nuts and will have to perform a lash adjustment.
Higher ratio rockers on the 068 would be great but yes, you'll need to clearance the pushrod holes for them. If you don't want to mess around with modifying your heads for high ratio rockers and screw-in studs, just put the 068 in there with what you have now and be happy. Should work good... ;-)
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'72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car!
'73 Firebird 350/4-speed Black on Black, mix & match.
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