Looking at getting rid of a few of my older saws and picking up a 395 or 660. It would be a stump saw for the most part and run a 42" bar from time to time but for the most part a 28 or 36". I have an 066 with a dual port and like it but was thinking of porting a saw or possibly having it ported. Leaning towards 395 because I don't have one and would like to try. Does one make bigger and or easier gains over the other with porting? Thanks