Flared hard line to AN fittings?

I agree that AN fittings are overly pricey. I use those at work (aerospace) but not on my cars. Mostly used for show cars or racers where price is no object. Push-lock is good, but seems to have fallen out of favor in new cars. You can get parts at auto parts, but fairly expensive ($20 for 20" tube).

Most new cars use nylon hose. You can get those at auto parts and are also pricey. I understand you just force the stiff nylon hose on, with a little water lubricant. No clamp. I don't think you heat shrink it, though the finished connection looks like that. Easier if you soak the end in hot water first.

Whether you can use rubber hose and hose clamps is a question. Holley's TBI kits had you use just hose clamps, but those run 22 psi max. I wouldn't use a regular screw clamp. Special "fuel injection" hose clamps are better with a separate screw/nut and full flat contact on the hose. There are also various crimp collars. I read of the new nylon fuel hoses cracking at the fittings, so fuel leaks are not uncommon. Fortunately, even a tiny gas leak makes a tremendous smell so is quickly noticed.