The builder gives good advice, and I can add a couple of things.

Check fluid levels daily at first, especially the coolant. You can be sure the builder put heat tabs on the new motor for a tell tale sign if overheats. Melted heat tab means no warranty.

Let it warm up a few minutes every morning, just until you see the some movement on the temp gauge.

Don't let anyone else drive your rig, ever.

Carry some correct coolant and oil with you in case you need to replenish, and keep the receipts.

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"I was a dirty bird, Carol's not grungey - she's *****in" John Milner....American Graffiti