Re: To buy an L78 or not...
I suggest buying into the money market instead of a buying the L-78 if you want to make money. Your engine builders are telling you the truth.
If you want more performance consider buying a used ZZ502 motor for about $5000 and spend the other $1,000 on a rebuild for the 502. It looks like a 396 (has a short deck height and with a 396-375 horse decal 9 out of 10 will believe the decal at any car show you go to).