I have used the same engine builder for 25 years now and not one time have i ever checked his work .
Now one time about 3 years ago he called me and told me to double check the timing chain bolts and i did and they were fine but he thought of it before i got it put in the car but why pay some one if you have to go over everything they do .
If you are going to do that then just have the machine work done and put it together yourself and save the money whats the point of paying them to put it together if you have to redo it .
Just my 2 cents worth them bolts didn't come loose because it sat on a engine stand they just wasn't torqued the first time .