hi , i am looking for some performance mods for my 05 Sierra with 5.3 engine.

first i was thinking of an procharger kit but i dont find any dealer who whants to ship it overseas ...

so next was a head ,cam and perhaps stroke kit from tsp but they are not email back about my questions for shipping...

now i found a dealer here in germany where i can get some lingenfelter edelbrock cylinderheads and a Comp Cams XFI™ Xtreme Truck Camshaft
- Stage III - Hydraulic Roller .

but i think if i would swap the heads and cam i could stroke it up ...

here are my questions

what parts would i need to stroke my engine ? and is it worth it ?

or do you now a shop where i could get a procharger complete kit with handheld ,injectors ?

thanks for your help !
i really need some power cause my 24 inch wheels have slowed it down so much...