I used the 166k lockup for a 904 in my 5th in front of both a 998 and an A500. car had a mild 360, stock long block, home ported heads, headers, RPM air gap, and a 600 eddie. gears were 3.55's, tires 27", car weight ~3900lbs w/o driver. The 166k would brake stall to about 2300 or so, and flash to about 2800. worked real well in the car for the combo. was a bit of a sloppy converter, engaging/disengaging lockup would drop cruise RPM by about 400 RPM. I miss that unit. I took it out when I replaced the 360 with a roller cammed, magnum headed 318 because I discovered cracks in the converter hub.

assuming you'd be similar weight, but more torque and more gearing, I'd say a 166K will stall even higher than it did in my lower power/lower torque environment, so I'd say the 175k is going to feel way to loose and sloppy for this combo, and probably flash to ~3500+....

if you were looking for a cheap converter, I'd probably start out looking at a factory high stall unit, I've seen those advertised for about $110....