My first 2bbl to 4bbl swap.. scratching my head..

By around 1972-73 Factory 4160 Holleys were known to have problems and were taken off at the dealerships and replaced while under warranty. I have had three or four laying around since that time that a couple of line mechanics were tossing out and gave me. I vaguely remember someone saying the secondary metering plates were warped, compared the Chrysler plates to aftermarket carb ones, decided they would just be too much trouble, and never did anything with them.
At any rate, they were smog era carburetors calibrated for a big block (383), and even one in good shape would most likely require wholesale changes (pump shooters, main jets, power valve, secondary vacuum pot and spring, etc.), not to mention conversion to 4150 configuration (secondary metering block and jets instead of plate) to get the secondaries dialed in to make one right for a 318.
My plan for any basic 318 would be 302 heads, a dialed in stock mag pulse distributor set up with a GM HEI module (the slant six. org guys have had this one in their bag of tricks for years now), a Thermoquad tweeked for the 318 on a Performer manifold, and decent exhaust.