86 Dodge Omni all very good but

My son has an 86 GHL 5 speed for sale but does not know what the
market is like for it.
It is in very nice condition inside and out. Mostly original. He did
a lot of work on it last year, exhaust,catalitic converter, timing
belt , black box etc. BUT oil pump plugged on him for a second and
he it did something to the engine. Can still run but engine needs to
be replaced or repaid. This is a beautiful little gem.
I've seen what some folks have done with these cars and know this one
is worth fixing up. Color is Black, fancy wheels, This car was
garaged for most of its years. Little to no rust. Can any one give a
suggestion on how much he should be asking for or where to advertize
it. We live in Massachusetts. Thanks
Russ James