AC and gas tank redirect help

[tripleblack]

My 69 GMC truck does not have AC and i live down in Texas and that is a necessity. I am about to order a new system from LMC and i was wondering if anyone could give me any advise. I have a 350 and i was wondering if i should order it from LMC or somewhere else. I was also wondering if i needed to replace my radiator to an AC radiator... after everything, the new system and radiator will cost about $1,000. Is that a good deal? I was also wondering if i should move my gas tank to the rear of my truck from the cab? Is it hard and is it worth it? If so what size fuel line should i buy for a SWB... and do i have to buy a different fuel pump for the different length fuel line? thanks for the help.