Which A/C to run in my 70 project

[Brandon_70]

I am new to the forum and hope I am posting this in the right forum. I am building a 70 C10 that has a 68 front clip. This is my daily driver and being from Texas, it is hot! I am debating on which aftermarket A/C to run? I do not want to go with factory due to me eventually shaving the firewall and the fact that the blower motors blow harder in the aftermarket kits. I really do not want to spend $1300 to buy one, is there any other manufacturer or options available? Any info would be greatly appreciated. Thanks