If it has the "crows feet"or reinforced cranksaddle webs, it's a HD block. Besides the crank snout/ dampner being bigger the distributor shaft bushing is larger and requires a larger diameter distributor shaft. I think there is a bushing you can get to size it down to the FE size. The
oil pump drive shaft is also larger. Be carefull as you purchase parts to finish this As Woodz stated there are some major differences between the FE and FT. If there is a date code on the block post it as it will help pinpoint what you've got there! G.