cylinder heads / reaming valve guides?

Hi Guys,

friend of mine has got a set of worn J-heads, they need valves, guides, valve job etc.....full treatment. To save some money, is it a good idea to get some oversize stem valves and a reamer to refurbish the guides? Can anybody give me some info where to get this reamers? I think with .005" or .015" oversize i can fix the guides.....

What kind of clearance should i shoot for? Thanks for Info!

Michael