G'day Bushie did I get more torque out of the Mustang well to run it seems strong so my mods did help it's a good strong workhorse, but what I did to that Mustang was mild to what I do now days......Should you chamfer the ports yes,for me it's not just to stop a ring catching on a port but also from what I have read the sharp edge of a port can wipe oil off the rings? who knows but sounds good to me so do it for peace of mind.....