Um I really hope your arent running E85 in your truck... im going to assume you meant E10. (E85 is ~85% Ethanol, E10 is ~10% Ethanol) E85 is corrosive to old fuel systems and wrecks havoc on the seals/metals used in older fuel systems. E10 is not a problem in older fuel systems, its not ideal but it still works fine.
Anyway assuming you did mean E10 then that should not cause any problems with your timing. I cant give any advice on the timing chain though since I havent changed one on these engines yet.