Here is a picture of the marks you were suppose to use. You will need to double check to make sure the marks are right and if so check the condition of the pistons. If everything is good up to this point you likely have valve problems. You can get a used head from www.car-parts.com sort by price and have them ship it to you. Let me know if you have questions, thanks.
Technician
Automotive Diploma 2 Years