Just bought some used Edelbrock RPM 340 heads... for my Magnum

I was about to purchase a pair of EQ Magnum heads for my build today when I came across an ad on Facebook for some used Edelbrock RPM LA heads for the same price. I didn't realize until after sending the money though that these are the stupid open-chamber ones meant for factory pop-up 340 pistons, and I'm putting them on a stock 5.9L Magnum short block. If I can manage 9.5:1 compression I'll be happy, is that possible without having to mill the heads or change pistons? Also any other potential issues you guys can think of besides rocker oiling (what would be the best solution for that btw)? The heads come with valves and springs but some of the valves got bent so they'll probably need a valve job and maybe guides checked... this was kind of an impulse buy because I knew someone else would grab them quick if I didn't but compared to buying new EQ heads and getting them prepped I think this is a petty good score no? They were $750 shipped btw and also include a set of head studs which is nice.