McIntosh C28 preamp and MC 2505 power amp landed in my lap

I have a neighbor that used to sell HIFI equipment. The store sold McIntosh and other brands back in the day.

He dropped off these 2 pieces to play with. He want $1500 for both pieces.

They do need service because both were made from back in the 70's. 

They turn on but I have not connected speakers to them yet, I need to dig out old bare wire speaker cables.

The question is, should I get them up to great condition and sell for $5000 for the pair or sell them for $2500 as is.

I see the C 28 preamp for sale for $1500 and a MC 2505 power amp selling for $3700 on line. Who knows what condition these are in.

What says the brains here on Audiogon??