You can always retime it. Not all that complicated IMHO.
Iceman has the right idea... you should be able to see if the cams are way off time.
Otherwise, I would loosen the sprockets on the end of the exhaust cams, effectively isolating the cams from the crankshaft. Turn the camshafts so that no lobes are pushing on valves... The engine should turn unless a valve is sticking into a cylinder or something is jammed in the valve chain system or in and around the crankshaft. If it turns, retime the camshafts one side at a time.
If you remove the cams while lobes are pushing on valves the camshaft will lift and that can be bad...
This should work... unless I have forgotten something.
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Grant
Arctic Silver 2000 Boxster S - bought with a broken engine, back on the road with the engine replaced
Green 2000 Boxster 5-speed and 1978 928 auto
1987 924S 5-speed (Sold) - Blue 2000 Boxster 5 spd (Sold)
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