Hard core guys will scold me for this, but I must say that when I need machine work done I take my blocks to PRODUCTION shops...NOT race shops. I have only twice dealt with a PURE race shop for my street car needs, and both times was strung out FOREVER waiting on work to be done (and I paid a bundle for what they did).
Considering I do all I can do myself - but have to defer to the pros when it comes to equipment and tools I don't own, most of what I need machined is basic bore work - milling, and hot tanking.
If you don't know of a shop, talk to your local Chevy dealer and find out who they send stuff off to for repair - these will be high volume production shops. They crank the work out - fast. Sometimes you can talk them into doing some stroker clearancing - but not always. However, this is something you can do at home with the right information and some basic tools.
Again...hard core guys will flame me for this...but for a STREET car, balancing is NOT the end all and be all that it is made up to be. I challenge the average guy with the average ability to tune a carb and timing to be able to tell the difference between a balanced engine and a non-balanced engine ON THE STREET.
We get so caught up in the hype of ultra high performance modifications that we will start throwing dollars at street application engines that cost time, money, and cause things to drag out forever!
The last stroker I built was a four bolt 350 using a crank from a 400 chevy engine. We just did the old school stuff to it and I had a regular crankshaft production shop bore the block, hot tank, and grind the crank/rods - and press the pistons. Assembled it at home. That motor ran like a rocket, pulled like a bear...and ran for years and years of trouble free street duty and occasional drag strip fun.
So....if the dude is still sitting on his hands this Friday - pick the thing up, take it home - and put it together. You will enjoy the hands on fun and learning as well as pride of workmanship by having assembled all the internals yourself.
The guys here will walk you through ANYTHING you need to know about making the stroker crank do its job.
Chris and I are in total agreement above, spot on....second off, this sort of 'inside info' from an olde tyme engine man who legit did lotsa NASCAR work back when....he did his balancing at 3 am in the morning, no truck traffic....
most really critical machine shops doing NASCAR type work where the spin engines to ten grand or whatever, are out in the country and work at night for the same reason....
GROUND vibrations on that sensitive machine, stuff that suspensions and so forth could not take out, would throw off the readings, and induce errors into the balance....which is most likely why large engine foundrys/machine operations like GM/F etc just do not have all that accurate a balance job...
now today, MAYBE it has been solved electronically, but I dunno about that....