$1500 for WHAT? You gotta be sh***in' me
Water cast under the bridge of the past cannot be redrawn from the well of the future.
You got a fair price for those engines at the time and it is all you could have done.
Coulda, woulda, shoulda...nothing more than a fantasy that has no relevance to current reality.
The future is forward...not backward.
Turn your ship to gather the wind and sail forward.