Timing the dual overhead cam - spider 124 1.8L.. HELP!!!

i'm having trouble finding information about how to time the crankshaft when the cam pulleys are in line with the marks. there is no mark on the engine against which to time the crank shaft... does
anyone have an idea of how to go about getting something or what to do to improvise? i am currently having the head reworked and i don't want to bend the valves again by incorrectly timing the engine. ANY info about timing the dual overhead cam engine would be greatly appreciated. thanks
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The mark for TDC is on the cam cover

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(about 25mm by 15mm) where you can view the flywheel. You might find timing marks here as well.
Nick /////
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