Lots of people are doing it, check out andersonfordmotorsport.com (customer cars). Brian(dynotune) is only one you want tuning it he has tons of experience with 5.0 set ups. I know quite a few people that currently have stock block cars making upwards of 450hp.Two are making 500 plus, brian has tuned them all. As long as you have the proper supporting fuel system and you have Brian put a safe tune in it with 11.0 to 11.5 a/f it will last.