these guys certainly seem to be jumping down your throat for what is probably a couple hundred dollars in error, IF you are assembling this yourself.
I would say your estimates are close, for machine work and soft parts. Maybe a couple hundred more depending on the shop you go to.
realistically, the summit kit is just fine. If you happen to have the pistons in hand, then sure, the machine shop can make sure the bores have the best nominal piston to bore clearance. Otherwise, there is nothing wrong with the rings, the bearings, or the gaskets. The pistons, if you get forged ones, are just a little heavy, but are good if you ever plan to hit it with spray.
I use a machine shop guy down near Mt Holly, but I don't actually know the name of his shop! his name is Gil. I have also used martyn motors with no major problems. The yellow pages will get you what you need, if you can visit the place, all the better.
If you aren't sure what you are doing, it is usually best to have an experienced guy assemble it for you, there are some fine details that need to be paid attention to, but if you have the drive, its easily accomplished.
there are a couple of good points so far here though....a better timing chain might be worthwhile.
it seems like everyone goes to shortblocks these days. its due to either not knowing enough about it, or just not caring but having the cash. sometimes, its not enough space to build an engine, the list goes on. of course, don't forget all these fast racer types that scare you into thinking if its not super forged billet splayed 18 bolt-main titanium girdle that it won't last on its way to the local convenience store....
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