You can buy a whole Running Caprice with LS1 engine and 4l60e transmission between AED5k ($1.3K) to AED12k ($3.2k) in here.
If you want something stronger then you can go for a newer Caprice. They come with an L98 engine and 6l80e transmission. That will give you 361 bhp, 391 lb-ft, and 6 speed automatic transmission for about AED25K($6.7k) for the whole car. Or you can find the engine and transmission in the Junk Yard for AED16k ($4.5k).
Some people think that an L98 is inferior to an LS2 but that can't be further from the truth.
the L98 got the same LS2 block. So, it is basically an LS2 engine. But there are three main differences:
1- the L98 uses L92 heads; which are identical to the LS7 engine.
2- the L98 uses L76 intake. the L76 got bigger ports and larger runners. (basically identical to ls3 intake)
3- The L98 also comes with a bigger 90mm throttle body and 39lb/hr injectors.
The things that makes the L98 produce less power than an LS2 are the cams, exhaust, air filter, and tune. Swap in a hotter cam, Spring valves, headers, cat back, reprogram it, and you are looking at 500HP+ and 460lb-ft+ !