I hope it's ok I keep replying to your questions.
I'm running a 304 that has a ton of work. But it doesn't really need it.
The 2 barrel that comes on the 304's is a good carb. People swap them over on YJ's. But like you said FI is the way to go when you have the $$.
The ignition upgrade I think is one of the best. Some will say headers but I've ran fenderwell headers long enough to no longer be a fan. In frame headers are tight. Plus factory manifolds flow well.
I installed a flowkooler water pump but if you don't have cooling problems I wouldn't think it is needed. Even so I would invest in a a aluminum radiator first.
I'd be on the look out for a York 210 compressor and bracket. They come on a bunch of amc v8's. That is a great way to get oba (on board air) on a 304. If that is something you want.