64CudaZak,
Think of the Delta. Money, Time and Quality. Two will prevail, just which two? If you have the where-with-all to do it yourself then the experience is worth every minute/dollar you spend.
I have had multiple "local" back in the day shops machine, assemble and build motors for me. There are no guarantees that they are any better then "crate motor builders" however all things being considered I would do a crate motor. I ant to drive. I have lot's of friends with good success using crate motors.
As Regan said to Gorbachev "trust but verify". Good luck