ProComp/Speedmaster aluminum heads

I'm new to the discussion and I've only hit some of it so I dont know if this has been covered and I apologize if it has. But if you buy any assembled aftermarket heads you need to completely disassemble them and check guides and valves/valve job no matter what brand of head. The problems with the heads can be found before they are ran saving much grief later. TF and AFR have the same problems as Eldelbrock and the China heads it's just that Eldelbrock and the China heads have more.