[Healeys] New guy again question again

[Weston Keyes]

Hello Folks,

    Thanks to all for the excellent help with all my newbie questions.

Here's another one:

 Even though the car I'm restoring is a '67 BJ8 the engine "appears" to be a
either from a BJ7 or early BJ8 according to my research with clutch size
changes. The owner bought the car in Europe and recalls that the engine was
not the original and was possible a factory rebuilt one. I ordered a new
clutch cover and disc for a later BJ8 and found out the bolt pattern on the
flywheel is larger than bolt pattern on the clutch cover. Can anyone comment
on why they switched (to go to a diaphragm type?)and if there is a noticeable
advantage to the later type. I could easily have  another bolt pattern made on
my flywheel.

As always, many thanks.  You folks are certainly easing my learning curve.

Wes Keyes
York, Maine