I just ran my 508 on the dyno a couple of weeks ago.
I have RPM heads that flowed 308 cfm so nothing special. My compression is 11.94:1. same comp solid roller cam but with H.S. 1.6 rockers (actually measured close to 1.67) M1 single plane 4150 flange and a 950 HP. 2" TTI headers. Your heads are probably a bunch better and I think the dominator is probably somewhat better. My 508 made 645HP @5900 rpm and 643TQ @4800 rpm The heads were my choke.You should make 700 fairly easy with your heads. FYI on my engine going tighter on the lash .018 (comp cam spec Int..026 Exh..028) made less power. I tried an M1 with a 4500 flange it was within 2 hp of the 4150 flange M1. My 950 needed the high speed bleeds opened up from factory 32's to 45's and the jets ended up at 77's and 85's to get a decent AF ratio.