1.6 or 1.7 roller rockers with E-Cam and my combo?

Hey,

With the combo in my sig which is better, 1.6 or 1.7 roller rockers with E-Cam (E-303) and my combo?

Will I lose topend, but gain lowend?

Will I lose alot of power? Or will it be better or same?

Im thinking of changing them because I might do a stud mount conversion roller rocker install, and would need new roller rockers anyway.

Heres the specs of the cam E303, with 1.6 roller rockers.

http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=1329

Thanks