360 Advice Needed - Autocross / Street Engine Build

Seems well thought out. I would worry about that compression and 91 pump gas though.

3.91's might be a bit for a track day. But depends on your track.

Knock any rough spots in chamber. Debur that triangle point were the valve machining circles come together. Match head chamber bore to block bore on sides.

But andouble pumper probably give you better throttle response all the way around.

One with adjustable throttle blade helped me fine tune drivability just that extra bit.