SNAFU1929 I would contact the MARCOM model A club out of Foxboro. I am sure they can steer you to someone in that area that may be able to help.
Unfortunately Mike Cataldo in North Attleboro closed up shop and moved to Florida.
I have driven cross-country three times and since we avoid the interstates, unless absolutely necessary, I keep the speed between 45 - 55. On the interstate I will do 60 but stay in the right lane.
Tom Endy has a great overview of the Ryan Overdrive. May have some oil info, Check it out: https://www.santaanitaas.org/wp-content/uploads/2018/09/Ryan-Overdrive.pdf