5.3 Vortec / 4l60E install questions

[oldrustytrucks]

I have a 2003 5.3 truck engine and 4l60E with complete harness and computer. I want to put it in my 67' Chevy (2wd). I am wondering what all I am up against. I have a general understanding of what will need to be done but would like to know some of the problems you have came across. I would like to know my best options for the engine harness and integrating it into a stock 67 truck harness. I have heard I will not be able to run stock 5.3 exhaust manifolds and stock A/C compressor... Any frame or cross member mods? Any other pointers would be great! Thanks in advance!