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I was under the impression that you were currently using the MSD system. It should come with installation instructions. I was just suggesting a source for constant 12 volts to power the EFI.
Mike
Just tie the blue and brown wires at the ballast resister together and you will have 12 volts at cranking and running. You won't need to reduce voltage for the coil, so it is an easy source.
Mike
Back in the old days of my former line mechanic occupation, the older mechanic next to my stall sold his older customers on repacking their u-joints. Extra labor-no parts charge. He had the salesman tongue.
Mike
Is that pulley a press fit item? If so the pump could be damaged by pressing on the pulley without disassembly to support the main shaft. If the pump has a threaded hole the pulley could be drawn on with nut. Just can't remember what the Federal design was.
Mike
906 heads are open chambered and from 68, 69 big blocks. A 400 would have different heads so it's been at least apart enough to swap cylinder heads.
Mike
I do not believe a gasketed plug will protrude enough to cause any clearance issue, unless you have GIANT domes on the pistons. So proceed with the above recommendations.
Mike
Time for service. The grease seems to dry out after 58 years. Just like us! There are several vendors available that rebuild instruments. Not cheap but, you will only have it done one time.
Mike