Dear Fellow online community

I come to you knowledgeable folks looking for tips & tricks evens some sorcery, on building a mechanically reliable discovery 3 TDV6 Engine

any info will be deeply appreciated!!

briefly, this is the 2nd time my engine kicked the bucket. First, the head gasket blow as a result of a cracked plastic thermostat housing, this was back in 2014

in December last year, the engine seized up. since then it's been parked in a garage waiting for me to start working on it

I am now in a position to commence work hence the reason for me asking for advice before proceeding

thanks in advance