The timing covers are all interchangable on the block, but here's the catch...
The std and reverse waterpumps have the water passages made differently. Your main clue here is the number of waterpump mount bolts. Some are 7 bolts and some are 8 bolts.
If you have a serpentine belt on your 351 the complete kit from Mike should work fine. If you have a V belt you'll need a pump from a mid-80's 5.8 Bronco, C125-1230, std rotation, 8 bolt, driver's side inlet. That's what I run on my 393. I actually run Mike's water pump on a 5.0 that I had in the car before the 393. Sorry I mislead you.
If Mike's not sure about the pump he may also not be aware that the belt length is different, as well.
Here's a site to look at pics of timing covers. Note the differences in the water passages to the water pump.
http://www.bishopengine.com/pages/ma...pe=Ford_Covers
Ed