Need to make a decision fast 5.7/6.1/340
well if mileage isn't important then you can go with either motor.
both the la and hemi can be very reliable so thats a wash.
both can be tuned so thats a wash
both can be done to run with a carb or efi so thats a wash..
both can make reliable power so thats a wash..
its personal preference man.. but the decision will be made from some factor you have in mind. it could be so you can say you have a hemi, could be because you have all the bolt ons for the la already. these are things no one can answer but you.