I can also confirm a proper bosch starter using an ignition relay is man enough for a DJ engine although it won't spin up that fast.
One thing to watch out for is pressure plate clearance.
I have been running a 215mm sachs clutch with no problems but need to change it after a small oil leak last year.
The replacement was also sachs but this one fouled slightly on the lip where the clutch fork shaft is mounted.
I had to dremel it down a few mm's to gain clearance.
Had me confused as I had taken the heads off for a quick check and though I had left a washer in there or something
