Last January I decided to port my aluminum l98 heads for my 383 stroker with a comp 286 cam (hydrolic). First I port matched the int to the edelbrock gaskets as well as my single plane Victor Jr intake. Then I port matched the exhaust to the edelbrock gaskets which are perfectly sized to the Doug's full length headers. (Both int and exh ports were TINY compared to the gaskets) Then I just started gutting out metal from the insides till it "looked right" and then smoothed it ok the best I could. Hopefully I didn't destroy a perfectly good set of heads lol....

 

port matching is a good idea. many skip this step.

 

back in 1995, ported the original heads that came on my '84 vette 350 and it did make a noticeable difference Mostly I cleaned up the "flash" in the bowls,streamlined the guide bosses,and slightly raised the port roofs of intake and exhaust.The 'vette engine came with 76 cc '624s.

 

I've done 100 intakes but I'm still afraid to touch heads myself. I know if you touch the wrong area you slow the velocity and can make them flow less. The little that you did i'm sure will make a difference so good for you. It's a good feeling you get with tinkering with porting, I like doing it.