I read your other post first....
i really can't advise you to get any parts because i don't know for sure what will fit and what won't. I believe if you use a later HO 302 reverse rotation pump, timing chain cover and pulleys you should be ok and the brackets to convert over from a 302 should kit perfect. I don't think you'd need a spacer on the dampner, but i may be wrong, i thought 351's had the same dampner as 302's (at least the non-HO ones, but i think they're the same).
This link shows how 302 belts are routed (shows short belts, but shows generally how they're routed)
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'84 Mustang 5.0 LX
My car