How I've done it in the past Ken. Start bare metal, reduced epoxy, (to keep the millage down) then base, then Euro clear , I have also used a matte clear as topcoat. There are a lot of silver basecoats that would work depending on what look you are trying to achieve.
Slo is right, none of them will look like polished aluminum though. If that's the look you are after, you could try polishing the block if that's desired, then applying activated adhesion promoter, followed by clear. It works and holds up well. Thanks to Jim C. for turning me on to this.