Slant Six 170 vs. 225

So the guy has a dilemma: I remember 39 years-ago when I last drove this car that the original 170 was pretty sluggish (around 100 hp?). I would like just a little more pep. (I'm not trying to turn it into a muscle car).

Does anyone know how much HP is created with the two barrel carb with the two barrel intake on a 170?

My other option is...I have a spare rebuilt 1972 225 that only has about 1,500 miles on it that will get me roughly 145 hp. Will I notice a big difference with the extra 45 hp? Obviously a lot more work to do the engine swap.

I don't remember if I had any work done on the 170. I know it never used any oil and the odometer says 165k.

Opinions? Thoughts? You guys are great. Thanks