Real deal or move along?

This is my opinion....

If the rear is an A body 8 1/4" with the 3 range gearset, yes, $250 is a good deal! You won't get it done any cheaper buying, shortening, and buying the extra short axle for an 8.8 Unit! Either will require a different length driveshaft, so that's a wash, so yes, if the criteria you are looking for is met with this particular unit, $250 (or less if you wheel and deal a bit) is a good price!