440 Source Head Opinions?

While there are far better heads out there I'm pretty happy with my stealths. On a budget I paid 1000 CDN for the pair second hand had them worked over pretty well ( new valves, guides were very tight so those were fixed as well a good bit of porting new springs to match and 10° locks and retainers for another 1000 at today's exchange rate that's 1600 US all in.
They made 642 hp at 5800rpm and 645 ft/lbs on my 400/500 engine. Could I have spent another 1000 to make a few more hp yes of course but on a budget I will say so far I am quite happy with these junk heads!!
I would have spent the extra 400 dollars and got Trick flow heads. When it comes to performance engines and power the last thing you want to do is skimp on good quality parts. If you just want decent street car then these heads will work fine, if you want an all out street/strip combo then I would save for a good set of Trick flow, etc.