MOBS
The Mad Scientist
Well the 454 would definitely give you your desired tow'ability........but it's not the most efficient head design, especially the vortecs....tbi 454 heads would do you better for towing. But, if you want mpgs, the 5.3 with some work and a tune should give you a good mix of both. Like I said before, if you aren't towing anything really heavy and just carrying a bass boat, a vortec engine should be good to go, especially with it being an automatic, you'll be able to build your rpms.