440/727 value

I just had somone at work offer me a 440/727 out of a motorhome(he thinks a '73?) it was driven to where it was removed and he said it seemed to run and shift good.this guy is a gear head but more of a brand "X" racer and really has no interest in a Mopar.
I know next to nothing about big blocks as far as performance mods go so:

does this thing have any performance potential?
Do motorhomes typically have decent heads for performance use?I wold hate to buy it and find out all I really bought was a block!!
any thoughts on the trans??gear ratios ect??
Most important WHAT IS THIS THING WORTH??(all he said in passing as he mentined it was CHEAP)