Since the amps are going to VAC for a lot of upgrades (rebuild, tubes) I would suggest that you bring (or send) the amp PCs and ask them to run the inevitable tests they must run as a manufacturer with your PCs. They do testing all the time and should be able to accommodate you. Go with what they say...I'll make a gentleman's bet that they say keep the cords you have. And be sure to ask what PCs they recommend.
Considering that the amp will be essentially new I wouldn't make any other move until your totally familiar with the sound and they are well broken in.
Just my two cents.
Regards,
barts