Edelbrock Performer RPM (7577) and 360 Magnum CI heads

I like to port match the heads to the manifold, but probably more important is to make sure the bolt holes line up between the manifold and the head. They can be off if the block and/or heads are surfaced even a little. I stripped the threads on a head due to forcing the bolt to start in a misalligned hole. My Bad. Take head off and helicoil it.
The porting is straight forward and you can get the bits and die grinder from Harbor Freight. Will work for at least one set of heads. Just match to the gasket and smooth into the port both directions. Nothing fancy. But how much power is it worth? Don't know. Probably no that much, but it makes me feel like I did something.