If the 1998 is a Civic then yes it will fit.
A 91 engine will not fit in a 98 Escort. The 91 engine is from a generation II Escort whereas a 98 engine is from a generationIII Escort.
no
yes
Will a Honda civic seat fit a 93 Honda accord.
Probably no...
some parts will fit, but it depends on the part itself...
yes it will every civic from 96 to 2000 will pretty much fit.
no
Behind the front bumper and grill and in front of the radiator.
Yes 92-00 Honda springs are interchangeable
yes it will. it should bolt up to your transmission as well. the ECU wont work without a little bit of changing stuff around. you will have to do a wiring harness conversion.