I would say as far as adding value maybe alittle but it will def sell faster unless you have a unrealistic price.For the 98+ conversion.For a mint set a headlights you will pay $250-$350(oem),and the bumper $120-$200.The bumper probaly is not a big deal since you will probaly need it painted anyways so a few scuffs wont matter.You will also need the turn signals.So for 98+ conversion around $350-$600+ paint.Jdm conversion $1600-$2300+install(unless you do it yourself)+paint.So you could easliy go to $3000-$4000.So do your research and have everything lined up.