Are there any easy add ons to make more torque on a 170?

I've got this 65 Valiant with a 170 that I'm getting finished up to put back on the road. It's by far not finished. It's stock inside as far as I know. The motor is a 1966 170. It's got a Holley 1920 and stock exhaust and points ignition. I know the small stock air cleaner was restrictive so I added a 66 225 Cleaner Air Package air cleaner instead. Seem's like it might bring in more air since it's not closed up. I was looking in the carb specs in the 65 manual and it says there were 2 Holley 1920's for the 225 HP, one being a R-3058a. Is there a way to make the Holley 1920 perform better without having to change to a 2bbl? Is the Carter 1bbl a better choice for more torque? Will a Comp Cams Hi-Energy cam be worth the effort if still using a 1bbl? Do they make any ignition upgrades that can help torque? I see Accurate Exhaust makes a 2.25 exhaust system with a Magnum muffler. Would that help? I mean I've got my 73 Charger big block for the torque that I like to feel when I drive. But I like this Valiant, it's simple. But I want a little more than what it's got but don't want to do a motor change. Just looking for some ideas that work.