Flywheel has probably been lightened.
I suggest pit a timing mark on the timing cover, set to TDC using a pushrod in #1 plug hole and a dial gauge, then mark & file a V on the pulley.
This will give you TDC, then use a dialback timing light to set the timing with. Or, mark out the pulley with 5, 10 and 15 deg marks (use your schoolboy trig knowledge).

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
