Race bearings

You will find a few options on the internet like at Summit Racing or Jegs. Have you checked online?

Some examples of other options are Clevite, Sealed Power, Speed Pro, Mopar Performance and others.

I assume your 410 is a 360 based block. Here are some main bearing options.

1975 DODGE MONACO 5.9L/360 Mopar small block LA Main Bearings Parts & Accessories | Summit Racing