Be sure to save the illustrations separately. The opinions expressed here are my experiences, and your experiences may vary. I don't put myself forward as the world's leading expert on Holleys, but I do have some helpful ideas. In some cases, I may not be able to answer specific questions, but I'll do my best. I know very little about other brands of carburetors and have no information about them, only general operating principles. I have NO experience with any type of supercharger or turbocharger, so please don't ask me anything about your blower or turbo applications.
1969 Ford Thunderbird
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The following instructions are for creating a MegaSquirt to Relay Board cable. It is for those who are creating their own harness. With both boxes mounted, measure the distance between them from DB connector to DB connector - this will be the length that you will cut the individual wires. If you are not using a Relay Board, allow enough length in each of your wires to reach the target component. It is often better to be too long and trim afterwards, than to be too short and have to splice additional lengths on.
Carburetor technical support
How do I know if a vacuum or mechanical secondary carburetor is best for me? Answer For street cars, the vacuum secondary carburetor works best on mid-weight or heavyweight cars with an automatic transmission. They are more forgiving than a double pumper is because they work by sensing engine load. The mechanical secondary carburetor is best on a lighter car with radical camshaft and a lower gear and manual transmission or on a car that is going to be used for racing purposes. How do I tell what size power valve I need?
In trying to get the headlight door motors, I ended up taking out the whole damn front end - grill, bumper, etc. There was just no easy way to get to the door motors. I probably removed 50 bolts out of the front of the thing. Eventually I had half the car in the back of the truck just to get a couple pieces of trim and the headlight door motors, but there's nothing wrong with a few spare parts. I have heard since then that if you remove the horn it's easy to pull the motors right out the top, though the shop manual says you can pull them out the bottom, which is impossible.