I was going to do the same but don't have enough clearance under the trans to slide one forward. The only thing I could use is something shorter and really flexible going from the front of the engine. I have the same year 454's and fixed three pretty good leaks around the oil pan(s) by very lightly torquing a few oil pan bolts. That works but do it a hair at a time because you can't undo the compression if you go too tight. Each of my remote oil flanges leak a little where they bolt to the block, I have the o-rings and will do those when I haul it out.
Now that I've really focused, I think you can have leak free engines of that vintage w/o pulling them.
Bob