Welcome to the site, Steve.
Hmmmm... Remember that there are two lengths of 292 main cap bolts.
1955 - April (?) 1959 are the shorter bolts
May (?) 1959 [B9AE 6015-F blocks and thereafter] - 1964 are the longer ones.
The longer main cap bolts will not fit the earlier blocks unless you drill the main bearings saddle holes slightly deeper (two lip end mill cutter, not a standard drill bit) and use a bottoming tap to extend the depth of the thread to the bottom of the drilled main cap bolt hole.
Click the link below for John Mummert's listing of engine block casting ID info.
http://www.ford-y-block.com/Block%20identification.htm Hope this helps
NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York