Just want a good motor for the rig, it's heavy. Want something that will pull the mountain passes around here and run right at my home elevation of aprox 4500'. Doing more research has me thinking the stock 454 tbi unit might not be up to the new motor? I do have performer 2.0 manifold and edelbrock 650 or 750 carbs avail. I just don't want to put one motor setup in and then need/want to change it, rather have it right while it's on the stand. I also understand that the edelbrock carbs are the best choice? I also have been giving advice on carb size from 650 to 850 depending on motor, elevation, etc.