replacing head...degrees of rotation to foot/pounds.

Sirs,
Replacing the head on an'85 2.2L diesel. The manual, for the last two sequences of torque application, dictates two 90 degree rotations with a 10 minute rest period between the first and second.
Does anyone know what final torque this converts to?
Is this, in your collective experiences, the best way to go, or is a more gradual increase, by foot/pounds, more dependable?
I will, of course, be using new bolts, with anti-seize cmpd.
Thanks.