1962 305D carb spacer and gasket

[Ledslinger]

The carb on my 1962 GMC K1000 Suburban has a plastic spacer about 5/16-3/8" thick, with a heat insulating gasket about 1/4" thick above and below it. It appears this is about the correct amount of gaskets and spacer between the carb and the manifold based on the length of the carb mounting studs.

What is the correct spacers and gaskets, and where do you get them?

I'm assuming the plastic spacer is original, and the thick gaskets I installed as replacements when I rebuilt the carb 42 years ago. It appears all the carb kits I could find have one normal about 1/16" gasket in the kit that looks like mine, and couple of others same thickness but different shape.

Carb is Stromberg WW.

[Ledslinger]

Looks like the total stack between the carb and manifold is about 9/16", two 1/8" insulating gaskets sandwiching a 5/16" plastic spacer. 1/8" seems kind of thin for an insulating gasket. Maybe they were more like 3/16" each and compressed some in the last 40 plus years.

There's a good selection of Stromberg spacers and gaskets at Dashman's Hot Rod parts:https://www.dashman.net/

[Ledslinger]

Ben at Dashman's reccomended and I ordered this 1/2" phenolic with studs and gaskets:

https://www.dashman.net/product.php?id=209