Help…

Unless I missed it in the book, I see HIIT cardio is ok. I would like to do
this on 2 of my no lift days and have two questions:
1) Should HIIT be done in the PM training window (same as lifting) and would
you treat macros and shakes that day the same as if training with weights or
use the ‘off day’ diet regiment and stay low carb? I lift M/W/F and looking
to do HIIT only with Ab work on T/Thurs, and weekends off.
2)If I decided to do HIIT only in the AM (that would be an off lift day so
no weights training these days), would the diet and suppliment protocol
change?
I look thru CBL a few times and did not see anything, so assume it can vary?
I am 235 lbs, 182 lean mass, that puts me at about 24% BF.
Looking to add modest lean mass and lose the BF along the way.
Thinking that AM HIIT on off days might enhance this for usual reasons on
empty stomach, but not sure how that fits in with CBL and lifting days in
the PM?

thanks in advance