Well after replacing my steering gear on my 91 F-250 460 I noticed that my timing gear cover is leaking coolant around the block to timing cover gasket. So In the near future I will be doing a timing chain replacement and reseal the timing chain cover.

I did a search on this and found that there are some chain sets which are 8 degrees retarded while others are straight up. Now this is a little confusing because how the heck can a chain retard the timing 8 degrees? Or is it the placement of the crank and cam gears that retard the timing 8 degrees which would make more sense?

So basically what is the best timing set to get? And should I replace the timing cover?