When to worry about engine noises?

No I'm not suggesting what you should do just telling you what I've done. When I rebuilt my 4 speed..
I drove it like I stole it when I put a new clutch in I drove it like I stole it after I broke my engine and I drove it like a stole it....
First thing I want to know if it's going to break and leave me stranded. And I would double those efforts if I had a warranty...
Before it runs out...
Nine years later now I could go out and jump in that thing and I wouldn't blink twice at driving across the country except for of course the amount of gas it would drink LOL or the fact that I don't even have windshield wipers on it...lol.
Don't let these internet guru's (I have most these Ya-hoo's on ignore anyways..) get in your head just enjoy your hobby and don't worry about it. I'm sure you're like me and have good insurance with towing...
Amount of Gas used? Or the Price?