Adonis is clueless about how much a dude as big as you NEEDs to eat.
20+lbs Bodyweight up and down is a fart for you.
Carefull who you listen to.
Lots of crappy advice here.
Low impact is a good idea at your size.
As been pointed out buy one of the intelligent guys, your either bulking or refining the mass you built while taking in excess cal's and lifting heavy.
Gaining muscle looking contest ripped is fantasy. Just look at the guys who promote it.
Even a Pro like Shawn Ray never gained much after a certain point. Compare him to the guys that bulked more in the offseason.... But it All depends on your goals. If you want to throw away good muscle its up to you.
All the Bullshit about increasing your Heavy duty training to turn it into aerobics is Ass Backwards.
Weight lifting ain't for cardio, its for building muscle and its working for you.
As big as you are, maybee you want to do overhead press with the stair climber machine?
It makes about as much sense as turning your weight workouts to cardio.
Do your cardio FIRST THING IN THE MORNING BEFORE YOU EAT (Walk, stair climb, anything that works, you'll prolly break a lot of apparatus these dumbass are recomending... they never worked, lived, and ate with a 300lb+ guy. Clueless dorks.)
Cut back on the carbs as much as you can stand with out a Carb & Fat pigout backlash.
Lean Beef and other protine. Up the fibrous veggies to keep you feeling full.
Drink nothing but water or coffee. Eliminate ALL soda (even diet) and alcohol.
Avoid fast food or better yet, eliminate it too.
Ask for advice on the steroid board even if your not user. This board is a laugh.....
Good luck, Awesome size. Don't be in a hurry to sacrifice any of your muscle thats hiding under a little fat and water.
6' 6" 375lbs - 1800 cals...

What a asshole.