Don't ahve a 460 to look at regarding the leaky gasket...what is leaking, oil or AF?
Timing cover? You said you had to remove fuel pump...is it mounted to the side of the timing cover? Sorry, as i said, not too familiar with 460 motors...been playing with more modern crap too, so my brain gets foggy...perhaps more beer, but then it is 9:45 am here...

As for AF in the oil pan - just drain it BEFORE you run the truck! Let the drain plug be out overnight so it drains 100%. You should be fine, but you will want to check things for leaks after the truck has warmed and cooled 2 or 3 times.

True dedicated cheapskates would use silicone sealer and not buy a gasket for the fuel pump