NA? a walbro 255 would be fine, you plan on staying NA or gonna force induct it? theres alot of verribles to concider, pending on what youre wanting to do. let us know more of what youre thinking and how you really want this motor to perform. is there a rwhp limit you wanna achieve? you call make this on a budget? give us a little more detail and i bet a few of us could help ya out !!