The best way is to duplicate the basic layout of the factory set-up.
The MAF part of the tune is set for the factory location.
Might make a difference, might not.
Most crate engine kits I've seen say "x" number of inches from the throttle body in a straight piece of pipe at least "y" inches long.
Try this. It explains it better than I can.
LS MAF Sensor Location: GM’s Recommended Parameters for Best Results - Team CPP
In this article, we give the parameters Chevrolet Performance recommends for LS MAF sensor location when building a custom air intake system.teamcpp.com
Thanks! I can work with that!