I just discovered my new ARP main cap bolts are too long.  As it turns out, I must have a block earlier than mid 59.  After that, Ford deepened the main cap bolt depth.
I was told go to your friendly machine shop and have them deepen the main cap threads.  I just got off the phone with them and they said they have never heard of this operation and are reluctant to go forward with the process.

I can certainly use the existing bolts or find new of the same length.  I was told the existing bolts are really too short for a high performance engine.  The ARP bolts are only available in the longer length.  I could try and find another machine shop familiar with the operation.

My engine will have 10:1 compression, a performance cam, and 3-2bbl carbs.  I may, if given the opportunity see my quarter mile time or run it on a chassis dyno.  Otherwise the engine will not see much severe action.

OK guys.  Need your advice and opinions.