I have a 1997 Mercruiser 7.4 and the timing marks are unlike anything I've seen before. There is an etched line in the crank and a single "V" shaped plate that appears to be the timing guide but there are no other markings on this. The crank is pretty rusty but there appears to be a possible guide just before the etched line on the crank. Does anyone have a photo of this set up and some words of wisdom as to how to time this. I've hooked up the timing light but was not able to determine where the marks are, other than the single etched line in the crank.