I have a 1987 Porsche 924S that is automatic and power everything. Really nice car and I was driving it and it got really rough. Checked it out, there was water in the oil and I seen it was a bad head gasket so I replaced it.When I put everything back together, it will not run. It turns over. The timing maybe off because I removed the timing belt and I marked the belt on the pulley but I think I have it marked wrong or something. Can it be a little off and not run at all? Also, where can I find how to properly time it? Please help.