273 4-bbl Hi-PO Engine Appraisel?

I have a complete 1969 273 4-bbl hi-po engine complete from air
cleaner to oil pan that came with my 1967 Barracuda "a la carte" It has an
excellent running 340 in the car now and I dont ever see myself using
the 273. Is this engine worth anything or is it basically a boat
anchor? I have a guy that wants to give me $500 for it. What do you
guys think? Hang on to it or sell it? Thanks.

Aaron