I had a good run out on Friday and the engine is still sounding good and runs well. One thing I noticed was that the idle was a bit unreliable on initial warm up, and the engine cut out a couple of times. By the time I got back it seemed fine, but since then I noticed it needed very little choke to start even in cold weather. This led me to suspect it was running rich, and a quick look at one plug confirmed this (sooty black).
The carb is Holley model 1848 (465cfm) which my manual says comes with a size 57 main jet as stock. I have no previous Holley experience (only Webers etc) but as far as I can gather, I will need to fit a smaller main jet to lean out the mixture. Can anyone suggest a suitable size to try (engine is completely stock)? I hear that the bowl gaskets on these cannot be reused, and that there are some better quality reusable ones on the market? Any useful tips would be appreciated.