The rotation is straight forward. I don't remember what pressure the Holley puts out but checkit as you may want to add a regulator to keep it around 6 lbs. I use a Carter which had many holes, allowing small rotational changes, self regulates to 6 lbs. I did find in the process that I had the wrong motor mounts and had to change them to get enough clearance. What a journey.
69 RS Conv,355,M20,4.10's and I don't worry about stone chips.