... I was discounting the 5.3L truck engines, but they're now a possibility as well since they have the same HP\TQ ratings as many other engines I see.
But there are SO MANY "Lxx" engine types to research!! Holy smokes... LQ4, LQ9, LM, L3, LY, LC...
... Some of them seem very model specific and it looks like I should stay away from them.
I didn't know there were 2 types of 5.3L engines... one type is considered an 'LS'? LS3
or something depending on application.
I can buy an entire 2007 Silverado for $1000 with a 5.3L in it, but there's 10 different 5.3L engine designations! Other than going by the specific 'Lxx' designation, this hunt could take forever. And that's not including the 6.0L combos!
isn't 5.3L, it is 6.2L
is an early 5.3L Gen.III block.
And the LS4
- while a 5.3L - is one you definitely want to stay away from unless you know what you're buying and need
The 5.3 is a great engine and has come in many forms - early LM4, LM7, L59 (all Gen III blocks) and the later LC9, LH6, LH8, LMG, LY5 (all Gen IV).
They came in both iron and aluminum depending on year and application.
The 2007 truck you found should have an LM7, which was an iron block with aluminum heads if it's a 2-wheel drive - while the 4X4's got the later L33 which is all aluminum (as was the short lived LM4).
One of the best things about these engines is their weight - or actually, lack-of-same, for the HP they produce!
Easy to knock 100~200 lbs off a vehicle with one of these swaps
The fuel consumption for the power produced is also nearly unmatched compared to any mods you would normally do to a older SBC to get these HP levels.
I'd do the 5.3L swap if that's the unit you can find now and it fits your budget needs.
You can always build and swap a LSX based monster in later
Getting a complete vehicle is often a great way to go, as you get pretty much every thing you may need to do a swap - less mounts, some fuel system things and other F-Body specific stuff ...