1.5 ratio rockers or 1.6?

I'm getting ready to order a set of crane gold rockers and can't decide whether to get 1.5's or 1.6's. I decided after the bottom end of the motor was already together that I wished I would have gotten a little bit bigger cam. The motors going in a Duster that will be a weekend cruiser with very little strip time. I plan on running 91 octane.

360 bored 30 over
9.5:1 comp
align honed to the ARP main studs
crank ground 20/10
eagle sir rods
windage tray, dbl roller timing chain
Comp XE274H 274/286 at .05 with 1.5-.488/.491 with 1.6-.521/.524
heads are 587's with 2.02 intakes installed, bb, gasket match
Eddy RPM AG
msd distributer and 6AL
carb probably holley or eddy 750
headers 1 5/8 or 1 3/4 havent decided and probably 2 1/2 in ex with flows and an x pipe
4 speed
probably 3.91 gears

Suggestions are greatly appreciated.