With a $3000 budget, you can forget anything other than a smallblock Ford or Chevy. I've seen non-running side oilers go for a good bit more than $3000, and if you're REALLY lucky, you may be able to get a bone stock BBC for $3k that MIGHT be running, but thats about it. The GM Goodwrench motors have poor power output, and many of them are made and assembled in Mexico.
IMO, your best bet is to have a local machine shop put together a fairly mild SBC or SBF.
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