quite honestly, if you didnt check hoses before install, if you didnt replace with new hoses upon install, then well its your fault.

The warranty that ICI Gave you on a USED motor with well over 50k on it was generous enough. Let alone them responding after closing their doors to help out a previous customer.

The fact you blew the headgasket, tells me one of two things, the headgasket was gonna go reguardless of who had the engine, or you didnt backflush on install and overheated it, blowing the gasket.

Replace hope theres no warpage and get on with it. Dont go crying on the internet. It is very unbecoming of someone who did their own engine install, or a man in general.