Old school standard was 2 degrees right thrust to counter P-factor. But as Gray Beard suggested if the print calls for zero degrees then go for what is called for then make adjustments as necessary. Easiest way to tell is to pull straight up vertical and see if the airplane drifts to the left. if it does then shim the left side of the engine to cause a small degree of right thrust.

Note using rightrudder trim will help your vertical drift but it will also impact other flight conditions which will need to be trimmed out. Correct the problem at the source... The plane will fly better...

Just my 2 cents and fully anticipate someone will disagree with me... But thats okay... I know what works for me...