440 source heads on a stock 440

I have a stock 440 short block thats been freshened up and balanced but it just has the cast low compression pistons, I dont have any heads that are done and was considering buying the 440 source stealth heads to use on it because they are closed chamber and everything would be brand new. I'm not sure if it would do much to bump the compression but I was wondering if anyone has run these heads in a similar situation and if they had good results.I have a new hydraulic cam thats 480 lift and 299 duration I think it was like 236 @ .050, is that too much duration for a motor with lower compression?