travelling from LA to Delhi, getting a layover of 1 hour and 50 minutes at Guangzhou Airport.

Yes, your time is enough for the transit. Just hurry up. You are right abou that you need to go through the imigration and security check procedures.
The following procedures is for your reference: Flight arrival, Inspection and Quarantine, Transfer Procedure (follow the staff or signages for security check), waiting and boarding.