Ok its a List 8007. Made on the 284th day of year "0" (either 2000, 1990, maybe 1980, that's all you can tell)
The 512 jet is a 51 Jet, the '2' is for close tolerance. Next you need to get behind the power valve and measure those 2 small holes, the PVCRs.
Metering block is 7240, not sure if that's right or not, sounds close.
Right in the center of the metering plate (secondary), there should be a 1 or 2 digit number stamped, like "34" or "59", can you find that?
Another thing to be sure of, I think I got my 390 Holley cheap cuz it ran like crap, wouldn't idle at all. Turns out the base gasket (base to main body) was the wrong one, the holes didn't line up right. Or even an old gasket can shrink, so check that carefully too.
