Hey CobraEd,
Looks like you are installing a set of 1.7 rockers to up your lift....you won't see much gain from adding a little lift, maybe 3-5 hp.....if you do this make sure to check you the tip on the valve through its movement to make sure that it stays in the center....most times on a non adjustable valvetrain you will not be in the center of the valve which will cause rapid wear of the valve guides, a cheap adjustable pushrod is available from trickflow if there is a problem to find what length you need....and make sure your springs can handle the added lift for coil bind etc....it can cause the springs to get hot/brittle and break.....stock piston notches will have plenty of clearence so you shouldn't have to worry about that.....How are you getting more duration @.050 from roller rockers?
Brian
www.teamcracing.com