Advice? 5.3/th350 273 gears?

[bloodybigblock]

So it's been awhile since I've looked at anything lsx related. I was pretty up to date on knowledge before I deployed so I'm a little rusty now so I need some help/advice. I just purchased another square body and it is a 305/th350 with 273 gears. If I switch to a 5.3 or a 4.8 and use the stock th350 trans and gears will I be okay? Will I have less complications with drive by cable vs dbw? This truck will not be a daily driver and I really don't want to put lower gears and get a 4l60e trans because #1 I don't wanna spend the money and #2 They aren't near as bullet proof as a th350 or th400. I was also going to use the dirty dingo mounts since they seem to be a lot of people's favorites, unless a new style mount came out that's better or a mount where you can keep the a/c in the stock position. So what should I do. I'm not on a budget but this is only a weekend driver and I'm not looking to tear up the streets, just reliability and more power than my weak 305. Thanks