hi denis , i guess it just depends on what you want out of a car , meening would you be content having a grey motor as a daily driver . there is nothing wrong with this , besides the lack of power at times
personally i`d keep the originallity of the FE and stick with the trusty old grey
besides ,you should be able to find a good running grey motor which would be alot cheaper than a re-build.
my fc`s a daily driver ,with a grey and keeps up with the trafic ( most of the time anyway ) and is very reliable aswell
hope this helps
coolaride
p.s speak to you soon .