Probably a Dumb 318 Question
What gearing would you do on this 318 since it will be street/freeway occasionally
Whatever gear/stall you choose, build around that, too many build to some vague power but cripple it with gear and stall selection. Stall speed is more important than gearing.
To me you want to build as much 3500-5500 rpm power as you can without overly compromising to much of the 1500-3500 rpm drivability (depending on personal taste), also wouldn't hurt if it pulled to 6000+ rpm, so basically looking to make peak hp around 5000-5500 rpm and peak torque around 3500-4500 rpm. If looking a decent Hot street engine, if looking to make more power than that got to go with more displacement and or more rpm (peak hp 5500-6500+ rpm) becoming more of street strip engine needing/necessary deeper gears and stall.
Eg..
323 making 1.18 lbs-ft per cid = peak torque of 381 lbs-ft around 3500-4500 rpm, if peak torque was 381 lbs-ft @ 4000 rpms would also be 290 hp @ 4000 rpm.
Say peak hp is at 5252 rpm basically half way between 5000-5500 rpm, since torque and hp is the same at that rpm, torque is generally around 87-93% of peak torque or so at peak hp.
So say 90% x 381 hp = 343 hp @ 5252 rpm. If that's not enough either needed more rpm and or higher efficiency which ain't exactly easy to do compared to more rpm or generally what people do is more cid.