HEI conversion question

67Dart273 said

Be aware you cannot simply "hang the box" in there. The HEI MOUNTING must be grounded (as well as some heat sink)

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Noted.
In the pic there is aluminum for mounting and for heat sink, I'm thinking some paste in between . Pic also shows a ground. Just need to figure way to attach alum. to box. Maybe a stud welder to box then mount alum.