Has anyone had any experience from these guys? I plan on buying a 383 sbc shortblock or a 6.0 shortblock from them

Lsx4u are the same people as Just chevy trucks.

 

I got my 2005 5.3 from Just chevy trucks. No issues whatsoever and would purchase from them again.

 

I prefer LKQ , craigslist, or whichever local wrecking yard has something

 

I got my 5.3 from them 6 years ago when i didn't know much about swaps and they were very helpful when i had questions. I even called them a year later to ask about a vss connector for my truck and they just sent me one for free. I dealt with Stu from Just Chevy Trucks.