318 head porting for the average joe

This is just my opinion and other will have there's.
Don't touch the floor(looks like it has been clean up a little already).

Don't take the bump out as it may help reversion if you do.
there are Many reason why exhaust ports are not focused on much........
Here is the simple answer: You can make or brake the performance of a port job much faster and easier on the intake side then you can the exh.