Actually, it doesn't matter - both orientations are correct. Remember that the crank makes two revolutions for every one revolution of the cam, so if you install the chain with the marks "one way" and then spin the crank over exactly one revolution, it's going to be "the other way". What matters is making sure that at TDC on the crank, the marks line up with each other. Then when you get around to installing the distributor, the rotor is pointed at #1 cylinder whenever #1 cylinder is near TDC on the compression stroke --- and I too forget whether TDC compression is with the cam timing mark "up" or "down". I just turn it over by hand and watch the rockers on #1 and the timing marks. When I see the intake valve close, I know that when the crank next says TDC #1, that's compression.