To rebuild or not rebuild, that's the question!

[tirebird]

I was talking with a local engine builder who works on regular cars and race vehicles too,..top notch. The subject of my engine came up and I told him I was thinking seriously of rebuilding the heads(#3964291), with new valves, hardened seats and new valve guides, rocker arms, etc. My engine only has about 24k and it leaks/burns a quart of 15w-50w Mobil 1 every 500 miles or so. Most of that I believe(by the puff of smoke when I start it warm) is from the original and infamous big block valve guides in combination with the super slippery Mobil 1.

But, the engine builder says it's a good time to do the block too,..new rings/bearings, polish the crank, new roller camshaft, etc. boring it .30 over.

My question is, I don't know if the "while we''re at it" argument is valid. I know any block can benefit from some freshening but I'm more than a little leary about "0" decking the block and erasing the "T0417CRR" numbers/letters off the front pad of this crate replacement LS6. Once they're gone they're gone and I will not go the "restamping" route or the acid route to reproduce or resurface those numbers.

What do you guys think?

Thanks