Alloy Heads

Hi guys, I've decided to ditch the J heads I have for my 390 Stroker build & go with a set of Alloys. A place here in Aus has them complete, hand finished for $1350 a set & they flow close on 250cfm at .500 & 58cc chambers. I figure by the time i get valves, springs, retainers, hardened seats & all the machining work on mine I'll be looking at nearly that much anyway. So anyway my question is does this seem like a good deal, decent flow to suit the stroker & will my stock rocker covers fit them ? I'm trying to keem a stock engine look & didn't really want to go A/M alloy covers. Any coments are greatly appreciated.