I just last night hung my engine, an O-360 A1A that I rebuilt.
I learned a lot, probably saved a few bucks, but do have the intimate knowledge of what's inside.
Rough costs?
Core (assuming all internals are capable of being overhauled: ?????
Case and internals machining, magnafluxing, new bearings and rod bolts: $ 2800
Cylinders (New Superior): $ 3700
New Magnetos, wires, plugs: $ 1150
Overhauled Carb: $ 650
Fuel Pump: $ 275
Starter: $ 350
Misc Stuff: $ 1000
A new crank can be had for $2950, and I've seen Yellow Tagged cases as low as $1800.
The machining costs are a high estimate. Standard bearings (rather than oversize) will save you about $400, and you may not need everything rebushed, etc.
I'm sure I've left out a few things, but my Misc. category should pick up most of it. The real question is the cost of the core, and the integrity of the case and crank. Any core you buy should be identified well enough to prevent the $3000 hickey for a new crank, or the price adjusted appropriately! Same goes for the case.
It's not really that hard to do, most of the work is in packing up and shipping off parts for overhauling, and then cleaning and repainting stuff (brackets, induction tubes, pushrod tubes, etc.). I used brand name guys for the machining rather than local people, so there may be a few bucks to be saved there. New cylinders were a $200 premium over rebuilts, so that was a no brainer.
I'd like to think that I did a first class job. I know that I used new parts where a standard overhauler would not have. Probably very close to a factory reman. So when comparing what you're getting, keep that in mind.
The biggest unknown is the core.
Now, just hanging there I can say with much pride that I BUILT THAT!
Sure hope to hell it actually runs!
Dave