Wiring kit + computer for 5.3L swap

[Moabdude]

Thinking of buying a 5.3L to play and test with LS type of engine. I have 700R4 transmission I can use for this engine.



I can buy 5.3L engine of a 2003 Silverado with 70k miles for $650,-. That includes a LS intake, fuel rail, TB and injectors.
The MAF, wiring and computer are missing.

Please advice about where I can get the wiring kit and computer for this swap. Also what MAF should I get.
Just the plain and simple wiring without all the extras like air conditioning etc.

Thanks