Hi,

I am new to the site and so far have been getting great help w/ purchases from other members. But I have hit a minor red flag and i am sure someone here can help or lead me in the right direction.

I am doing a swap into my 95 chevy 4x4 Z71. I purchased a LM7 and was told that it came out of an 05 tahoe. Purchased from a law enforcement officer that decided to delay his own project. He told me that he trust who he bought it from and after removing the heads the cylinder walls looked better than I could hope for. The heads are in the hands of TEA for a port job and I just received the new cam (slight bump up comp cam XR265HR-14). But I am not sure that it is an 05 5.3 motor. When I look for a new timing chain set I see PN# differences from 04 to 05 and probably earlier. The following is where I have researched so far:

1) Block: LM7 “2002-2005”
A) Casting #: 12567392
B) Service PN#: 12567393 “2002-2004”, “05” N/A

2) Computer: “2001-2002” red & blue connectors, cable drive
A) PN#: 1220041

3) Intake: “1999-2003”
A) PN#: 25344062
B) 3/8” supply w/ 5/16” return

4) Fuel Injectors: “2001-2007”
A) PN#: 25317628
B) Flow Rate: 3.180 gm/sec or 25.2lbs @ 58psi

5) Throttle Body:
A) 116913B

The engine could be out of an 05 and he purchased an earlier throttle (by wire) and ECU or ? The engine timing sensors are located top back and passenger side lower block location. I want to put a proper timing chain assembly and who knows what other future info this will affect.

Any help would be appreciated.

Thanks!
Brian