7.3 idi timing

[Mhannink]

im not sure where to ask this so i figured this would get the widest base of expereince here my question is im doing the timing on a 90 7. 3 idi and i know i need a wrench thats been modified(bent) my question is does anyone know how many degress of bend i will need to make this easier i know someone asked a while back and the guy who had rsponed said how to do it but not the angle of the wrench he used which i need i don;t have time to play w/ this much and want to do it on the first shot if possible any help would be great and thanx in advanced