Timing will be tricky as the specs will no longer apply. Worn timing chain,weak advance springs,vacuum advance,carbon build-up,fuel etc. all have an effect on finding the optimum timing. Take it to a good experienced mechanic to have it set. Timing will be tricky as the specs will no longer apply. Worn timing chain,weak advance springs,vacuum advance,carbon build-up,fuel etc. all have an effect on finding the optimum timing. Take it to a good experienced mechanic to have it set.