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OK got some new info and the results are ... it's the dash gauge and Rocketman is the recommended vendor for recalibration. I did put the Spectra FG 86B in the car Oct. 10, 2019 at 20,280 miles. Kept a record of gas fill ups, ohm readings and mileage. End result was with the gas gauge needle dead on E I got a 65 ohm reading. I still had about 5 gallons of gas in the tank. Bill Basore at Desert Classic Parts refurbished my C9WE-9275-A Sender. I installed it yesterday, at 22,325 miles, with much the same results. With an empty tank and the needle below E I got a 66 ohm reading. With 3 gallons in the tank I got a 53 ohm reading and with 20 gallons, at $6.70 a gallon, I got a 10 ohm reading. I called Basore, relayed my findings and he confirmed the dash gauge was the problem. Basore took a bit more time to explain the why and how but that's the short story. When I pulled the Spectra unit the float had an eyedropper of gas in it. Other than that the Spectra sender did a good job. Because I am not taking my dash apart to get the gauge out, right away, I will live with Empty means 3 gallons of gas in the tank. Close enough. Brian

I pulled all the plugs already and cleaned them yesterday. There were all black with carbon buildup. I’m pretty sure I’m going to install a relay so the voltage will have less chance of fluctuating. When I metered the green/red wire with a fully charged battery, it still has fluctuation when cranking. It was still within the Holley suggested range but it’s more of a drop than straight off the battery so a relay should help with that.

I run the stock tach and I will suggest you get one big enough to see. My stock set up is so far inset in the dash cluster it takes a while to focus. I don't like taking my eyes off the road for that long. Numbers are not big enough and the lighting is poor. I have mine taped/marked with the important numbers. A large one on the column with shift points/lights would be the ticket. Brian

I know I'm a little late to the conversation, but I too used a 5.0 thermostat housing on my 393W. It worked out perfect with my oversized radiator.

A quick update: 1-the 408 stroker finally arrived in the crate across the pond after 9 month of delays, shipping issues etc 2-taken some times to get the various ancillary parts, shipping to U.K. is a real pain; JBA shorties etc 3-engine fitted and hoping to fire it up in next 3/4 weeks 4-just collecting the other parts to complete the car e.g glass will go in next 2/3 weeks car is booked into a major U.K. classic car show on 10 `July so has to be ready, but not sure if I’m going to make it chris

the fuse block and green piece on the drivers side firewall plugs together. If u remove the bolt in the center and release a couple of clips on the green piece it will unplug. The larger pin on mine was burned and had to replace with new pins. I have also found problems where the wires are riveted to the conductor bars on the fuse block.