Hello all,I have a Holley 390 cfm carb comming and I already have the late B manifold ready to install.I want to use a phenolic spacer.Is the Mr.Gasket 3404 going to be correct for this setup.I am not after power just want a good running stock motor.I will also install a new thermostat at the same time.What temp should I use?By the way I do already have the 57-up distributor.Thanks Mark