...Doug is Right! Copper Gaskets Require a Higher Torquing to 'Crush' the Copper, Period. You can get this with a Stud kit...remember 40% Higher Clamping Force!!
As far as the Manifold End Seals, I do Not Use the 'Red' Permatex gasket maker, It is Too 'Grainy'. I use the Permatex 'Black Ultra'. The way I do it is...Squeeze a 1/4" Thick Bead of Silicone on BOTH surfaces of the Head AND Manifold, don't forget the Corners and the Major Gaskets go on First, Over the (4) Studs. Then Drop the Manifold Down while the Sealant is Pliable, Not Even Taky, this Guarantees the sealant will be Squeezed into Every Void, Plus the Sealant will also 'Stick' to the Manifold, for a more Perfect Seal!
...I see the Aussie drops the Manifold on, THEN installs 4 'Guide Bolts' Finger Loose, does a Little Shimmy on the Manifold, and then Starts Torquing 2 bolts on the one Side Only, No Torquing Sequence? Is This Serious??
Last in My view, the Red 'Mountain' of gasket maker is So THICK, he will have to really Torque on Those 'Aluminum' Manifold Bolts, to come close to compressing that mound down for the manifold to be in Alignment! And The sealant will Not be 'Adhered' to the Manifold Itself! It is Sure to Blow-Out. It's Not Very Smooth where it counts, and Grainy. FWIW
MJ