Is the early 28 different than later years, as far as gland rings?
For my car (a late 31), I purchased a length of
https://www.aceraceparts.com/collect...ess-2-0-length
and just cut to length (using a lathe). The O.D. is a nice fit in the counterbore and the I.D. is the same as the port.
If the glands are the same (early vs latter) then any gasket would have to have a minimum I.D. of 1.5", at least on the exhaust ports. I have a length of this 321 stainless tubing. If you want I'll slice you off 4 rings, pm me.
Tom