Larry,
I owned a 180 hp Lycoming powered Cessna 170 B for about 20 years, I currently own a C-175 with tailwheel conversion and 180 hp Lycoming power. I have also flown a C-175 with the O-470 (though not a tailwheel conversion) a fair amount.
If I had a choice, I'd definitely choose a 170 B with a big engine (O-360, or one of Stoot's conversions) over the 175. A couple of reasons:
1. With these airplanes, it's all about empty weight. My old 170 B weighed around 1356 as I recall. While gross weight is limited to 2200, that still offered over 800 useful. Understand that airplane was really light for a 170..... It was a very good 2 person airplane, and three with stock fuel load and not much cargo.
By comparison, this 175 weighs right around 1500 empty. I cannot figure out where all the weight is, since this isn't a massively equipped airplane....there is 15 lbs of lead in the tail, but tough to get at, I'm going to try to remove it.
2. Stock fuel is a bit limited with a big engine, but if you're not doing long unrefueled legs, shouldn't be an issue. I had Flint tip tanks installed on it, so max fuel was 60 useable if I topped off. Sixty gallons of fuel weighs 360 pounds, so even with tanks and aux full, it was a good two place plane.
The 175s came with 52-53 gallons of fuel, depending on model year. That would be nice, but nine gallons of that is unuseable, unfortunately, because each tank only has one pickup. So, mine has 43 useable, but that unuseable 9 gallons adds 54 pounds to the empty weight. Ouch! Now, I'm pretty sure that the engine will run just fine well into that 9 gallons of unuseable fuel, not that I've ever done so....but that'd be straight and level only.
3. A friend of mine who was a very experienced Cessna pilot bought a 170, and his comment to me about it was that the airplane was almost "Toy Like" with regard to the controls. In other words, the controls are VERY light, and the airplane's stability isn't great. No big deal there, but you have to fly the airplane ALL the time. No worse than a lot of other old airplanes, though.
When I bought this 175, I expected pretty much the same control "feel". Wrongo! This 175 has a control feel very close to that of an early 180. Obviously, the tail is larger than a 170 tail, which may be a lot of this.
I was looking for a good 170 B with a 180 engine when I bought this 175. Good 170s with a 180 are scarce on the used market, and most are sold by word of mouth.
I like the 175 in many ways....just wish I could lighten it up more, and I'm doing some of that.
The 175 with an O-470 has buckets of power, but it's really nose heavy when empty. The one I flew had been stripped out to carry as much stuff as possible. I could see the control bell cranks from the pilot seat....seriously stripped. I wouldn't go there, myself, even if I got a deal.
MTV