you need to check your compression after you put the head on. do you run pump gas or race gas?? timing will bring the low end on stronger and the lightened flywheel will make the bike rev faster. I think you will be fine doing the mods you stated. just make sure that if you end up with over 155-160 psi you switch to race gas, especialy if you bump the timing up. dont want to melt it down. oh and do a plug chop just to be safe. usaly you dont have to rejet but it never hurts to check.