To a guy looking for a street rod engine, or anything that's not being "restored", a comparable Chevrolet Performance crate engine is going to be in the $6K range. Even though your's is a "new" 45 year old engine why would he pay more if he only wants an engine, and can get improved performance/reliability with a newer crate? Now if you're wanting to turn your NOS LT1 into the maximum cash you need to be on the Camaro/Chevelle/GM specific sites where guys are wanting a date correct performance block to complete a "numbers correct" (as opposed to "numbers matching") restoration, and you might double the price, or even more with a documented OEM 2x4's "warranty engine". I think I'd do some selective posting, or perhaps invest in an ad in Hemmings to see who might be looking for one, and willing to pay a premium for it. Someone that's doing vintage racing in a Camaro or 'Vette?