Max Lobe Ramp For Solid Flat

here is a close cam with a chevy lobe and small lifter. im getting a .385 lobe lift on 242 @ .050 which is getting close. i wonder how much of a increase ther is available from the chevy lifter to mopar 904, then to 1", even just .020 lobe would put me where i need to be.

http://www.summitracing.com/parts/cca-11-653-47/overview/

EDIT: chevy lifter looks to be .842