Good luck with those projects, That's great!.. Those a Model A and T H.C. heads took years to perfect and still not perfect...Always being tweaked because of performance and casting issues . Just less as time goes on.
Once you get 25,000 miles proven and 5 years aging on a head design...I'll buy one.
So get rolling !

D.M.S

Where Are You From? Ct

Do You own a car built by Durant? '23 Star Touring