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I'm not sure why it matters. There is really no difference for most passenger car blocks. If you are planning to build for performance, you know the type of block you need and the casting numbers that you want. A 350 is worth the same weather or not it came out of a vette or not. Unless its dated and coded for someone who wants it. Than they will pay a little more.
All casting numbers and engine assembly suffix codes are searchable on the internet. If you have a Corvette, what dates and stampings are correct matters most.
Depending on the 350 and year made, Corvette 350s had 4 bolt main bearing caps, so if you pull the oil pan, and it only has two bolts per main bearing cap, it probably didn't come from a vette.
Depending on the 350 and year made, Corvette 350s had 4 bolt main bearing caps, so if you pull the oil pan, and it only has two bolts per main bearing cap, it probably didn't come from a vette.
L-48's were 2 bolt, L-82's are 4 bolt. Both are used in Vettes.
If the block pad at the front of the pass. side head has what looks like a serial number and some other numbers it could be a Vette engine. Unless it's a high compression 427 or all-aluminum smallblock it's pretty much like any other Chevy 350. I hope you didn't overpay because it's a 'Corvette' engine.