I'm wondering whether the seller just got the engine specs wrong (the '78 Civic had a 1.2L engine) or it's an engine swap? Although a 2.5L engine in this car would no doubt be a hoot to drive.
Here is an 83 Civic wagon if you don't like the 78 https://bringatrailer.com/listing/1993-honda-civic-wagon/
That 2nd-gen Civic wagon above is enough of an improvement in size and features that it would be well worth it.... The first-gen IS pretty tiny......