318 head porting for the average joe

I'm a newbie to this,(did a set of 273, now doing a set of 340 x heads), but can't you just "lean" or taper the port back to your scribe line?
Looks good!
I’ve git the bowls cleaned up pretty good. I’ve scribed a 318 size gasket on the intake port. I think it’s 1.05” wide. My intake manifold is also that size. I can’t enlarge the port that much without breaking into the pushrod tube. If I leave it, it would be a pretty big mismatch. Not sure how to proceed