best 440 heads

I have 440 Source CNC ported heads on my 440. They were about $2000 for the set. I took them to a trusted cylinder head shop and had them check them over and they got the thumbs up. The main thing that is recommended is to remove and discard the springs, locks and retainers the come with and upgrade to better parts. The valves they come with are fine. The only thing I did not like was the pushrod holes needed a lot of work to get enough clearance for the rods. One huge bonus for me is the exterior of them looks like stock heads so you can paint them and they look like stock heads. I will say however, now that the Trick Flow heads are out I think they are a better value, If I were building my engine now I would likely go with the Trick Flow heads.