On my 351W I got from Ford it had an "A" and "B" set of timing marks so I could just put the stock timing pointer on the correct side. Also the timing chain cover worked for me, the new and old ones are the same. I needed a different water pump, 1970 and newer use a crossflow radiator which is what it's setup for.
Looking in the 2003 Ford catalog only one of the three 302s comes with the serpentine setup. Online shows that you can purchase a conversion kit that makes it work in a Fox body.
"This kit is intended for customers that purchase one of our 5.0L long block crate engines and plan to install it in a 1979-93 Mustang or other Fox chassis vehicle. This kit includes: dual sump oil pan, oil pump pickup tube, dipstick, dipstick tube, crankshaft damper, timing pointer, M-8501-C50 reverse rotation serpentine water pump and M-6059-D351 timing chain cover."
I think it comes the way you want it, just the water pump you'll have to change, I think.
I never found FordRacing.com to be very up to date though.