I have one of the rare Model 2305 Holley's on my Pinto, which is a progressive mechanical linkage 2 barrel 350 cfm with annual boosters that is designed for big 4 cylinder engines (or small 6s). The only thing you can buy to mount it or a regular 2300 is the adapter plate, so you have to be prepared to cobble up a linkage yourself if using a Holley. The 2305 works well, providing a much torquier output than the stock weber, although is probably a bit too big in overall flow capacity. Physically it is certainly tall compared to a Weber too, so bonnet clearance is an issue if you want to use a filter larger than 9" diameter and 2" tall. I've also heard from a local Ford tuner that he's never been able to get a 2300 to work well, which doesn't surprise me seeing they are designed for much larger engines.
If you are considering a 4 barrel, there is only one to use - a 390 cfm from many moons ago that again was designed specifically for small displacement engines, and of course you'll need a good 4 barrel manifold. The current 390 is NOT 4 cylinder compatible, so if you are really keen on a four barrel then let me know and I'll dig out the model number to look for. I hear they sell at premium prices though given their rarity, and with Holleys there are so many interchangeable parts that you never know what you are going to get unless you ask all the right questions to ID metering blocks etc.
If I didn't have the 2305 already I'd just go with a 38DGAS for extra pep as they bolt right on and are known to work well. These days they are pretty cheap brand new in the USA too (about US$220).