I know re stamping in the corvette world is high. I seen lots of advertisements on it and it was an accepted practice.

http://blog.hemmings.com/index.php/2012/...ping-standards/

From http://engineslimited.com/cms/

For more than twenty-five years, Engines Limited has supplied the nation's classic Corvette owners with numbers matching engines. Many of our services center around the block and heads of an engine. Our services include: numbers matching engine rebuilding, block stamping, block broaching, and searches for hard to locate parts.

Some of the parts we sell include: blocks, heads, rebuilt water pumps, exhaust manifolds, cast iron intakes, 6-inch and 8-inch harmonic balancers, pulleys, oil pans, and 6-inch & 8-inch timing chain covers. All parts (if not rebuilt) are guaranteed rebuildable. Blocks and heads are hot tanked and magnafluxed. Machine work starts at $1200.00 for short blocks and $1600.00 for long blocks. Call for current prices and availability.

We have done Bloomington Gold and NCRS (National Corvette Restorers Society) Top Flight & Duntov Marque of Excellence Award engines.