1.6 rockers with this combo?

You say you have ported heads, do you have a flow sheet with them? There are several members here who port heads that open the valves beyond the max lift the heads flow to keep the valve open longer at peak flow. Once on the way open, and once on the way back closed. If the port isn't just all to crap turbulent at the new fully open point of .588/.577 (and the average porting job on a set of Edelbrocks should flow pretty well up to the .600 mark, maybe even beyond...) it should be of some improvement. Rob is dead on, the quicker that you get the valves off the seat to .200 lift and beyond, the snappier it's going to be. I think higher ratio would work pretty well with the big Comp XE/XHR cam, especially if you spray it, but I'm pretty sure that cam calls for more cylinder pressure than what you'd have with it installed on the recommended intake centerline. As far as staggering the rocker ratios, it's pretty common to run less exhaust ratio in the world of SBC's with a lot of claims made that most SBC's see zero improvement on the dyno with higher exhaust ratios dependent on the majority of cylinder heads, so it's mostly left at 1.5 to improve piston to exhaust valve clearance while running higher intake ratios (according to IIRC Joe Sherman and maybe Steve Brul'e, anyway). I've not come across any LA Chrysler testing, but I imagine @Rat Bastid and @PRH would probably have some hands on knowledge in the field.