Where did GM hide the pcm?

[72timemachine]

While I have a 2007 lq4 6.0 liter engine out of a 2007 Sliverado hd, I was looking for the pcm location. Is it located next to the battery box?

I am slowly acquiring the parts I need to do a swap on my '72 c/10. From some of the research I have done so far, I believe I also need the transmission speed sensor adapter, wiring harness, pcm, accelerator pedal (this has the electronic one) and motor mount after market adapters. Anyone know if the factory (2007 Silverado hd) air filter housing and snorkel tube will fit in a 1972 c/10?

Anyone out there who has done this tell me what else I may need?

Thanks for any help.