300ex carb mod

[daaavie]

I have a 05 300ex that I am going to put a 02 400ex carb on. Will the stock jetting on the 400ex carb work, or will I need to rejet (if so, any size recommendations). Live in MI @ about 1000ft elevation and current mods to my 300 are as follows:

Yoshimura pipe and header, K&N filter, punched airbox, and stage 3 AMR CDI box.

Also would it be worth getting port/polish(bang for buck).

Thanks

[thyman17]

I would run it and see how it runs and if u need to change it like if its too rich take the lid off the air box and see if that helps if not then just get a assortment of jets for it and keep trying them till you get it right I bought a edelbrock for my 300 when i had it but it had alot of work done on the motor if ur gonna port and polish it i would consider bumping up compression maybe boring and throwing in a cam and hard weld the rockers i mean while u got the head off might as well do some more work to it...