After getting the thottle body in this weekend & replacing the busted cable
yesterday
(worldpac retailer here in vic,bc stock GEMO sold to me for 25)
I  find out why my vacum was not up around 17 when from 7-9 to 12-13 with TB
replacement.
Well I did all the basics then decided to do a compression test all are 155
except 1 at 75 :(
then did a getto leakdown test yup looks like a poached exhaust valve,
so now I guess I can become a real vanagonite I gotta do a head that last
right of passage i guess... :)

so few searches show that dirko sealant is what ship in Victor Reinz kit.
then I find few other posts
suggesting not to use it  either permetex 'the right stuff' or GM engine
seal. Part # 1234 6141

OK so what is the collective wisdom here ?