ChevellRCR & mikenash
I am using Gaskets-to-go head gaskets on both my Lister and listeroid 6/1s.
Very good quality, as OEM automotive gaskets.
Mine have been in service for a lot of hours, no problems,
Cannot comment on cost, as it has been a few years, but they were very reasonable considering their quality and that they are trouble free. Gaskets-to-go will also make custom gaskets if you have a drawing or pattern.
Cheers
Hugh