If you go with the 509 get the 108 LS cam and not the 112.
If it were me I would use the solid you have now
With Either cam, I would still want the adjustable rockers. So thats a given IMO. Ive tossed pushrods with the stock rockers with the smaller MP 484 cam.
10.8,s are easily doable in a A body with your current cam, 10.5 comp, 4000+ stall, 3.91 or 4.10 gear.
