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Usually there are marks that align on the head and cam sprockets. If not, use two dots of nail polish (or a paint marker) on the sprockets and head to mark where they were aligned, and then two different marks on the sprockets and timing chain to make sure the chain stays aligned.
Then, usually you get like a coat hanger or something to hold the chain in place, and then you fish the cylinder through that while maintaining tension on the chain.
Another way you could do that is remove the flywheel cover and mark a third spot on the crank sprocket and chain.
An additional way would be to forget about the chain placement, get a degree wheel, find actual TDC with a piston stop upon reinstalling the cylinder and head, and then using the marks for the cams, throw the chain on.
Make sure the tensioners and guides are properly lined up, and that you mark for tensioner uninstalled if marking the chain, someone installed the bbk without getting the chain guides lined up, and they had issues getting it together.
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