Im new here and i'm plannin to do a 427 lsx swap in a 2002 tahoe 4x4 i wanna run 87 or 92 pump gas its gonna be a tow rig so im wonderin what

-comp ratio i use
-what crank rods and pistons are good
-what gears do i use 4.10 or 3.73
- what would the mpg be with a s/c or n/a
- what heads
- what would be a good cam for more torque
- what intake would be best for n/a