big block pro comp heads

Getting back to the Pro-Comp heads. Has anyone here used them? I've been thinking about using these on my 499 buil
these heads can make big power dont buy the assembled ones use good valves and springs matched to your cam might need some machining to enlarge push rod holes for clearence and like any other heads porting makes power my machinist said the castings looked real nice but buy the time im done with machining and parts im right up there with the price of the edelbrock victor head