I can't be that retarted.....can I?

[78chev]

So I am just trying to time my 78 350/350. I started it up, hooked up a timing light, shone it all over the engine bay and I can't find any Goddamn timing marks. Before I bought the truck the engine was factory rebuilt w/reciepts. I've built plenty of engines & I know how to time the damn things but there just aren't any damn timing marks ANYWHERE! the balancer and everything is just smooth, and no pointer either. WHAT THE HELL!