@hyoretsu its not as obvious as it use to be so I had to look it up
again, assuming you use photoshop
on the text layer, go to its layer, right click it, and go to blending option
in there go to drop shadow
Turn spread to 100%
turn off global light,
turn opacity to 100%
and from here it's all 'to taste' or whatever looks good,
There is likely some other things you can do too, like getting a texture for a textured color and then when you do the blending instead of it being flat, it blends in a bit better, but the clone stamp tool should fix that
Just remember, make the image 200-300% bigger
typeset
then do the editing
You know what's covered, and what needs to get covered that way, this is just so you don't piss effort away on something you don't need to.
If you are going to stick with this, a good thing to do is spend no more than 5 minutes per page getting text off it, and what I mean by this is normal text that requires no redraw, if this is taking more than 5 minutes to do that, there is a way to do it faster that you don't know, try looking into it or asking around, some jobs like page 2, you shouldn't even bother attempting it unless you have a tablet or you have a good grasp of the pen tool, that said what you did is good, but I believe this is also the page that took an hour just looking at what was redrawn.
I also suggest that any text that goes over something that may get redrawn, add a shadow to it, this will likely minimize your work while also not looking out of place if not abused, and be easier to read in many cases.