Hi - welcome to the Alfa world.
I am pretty sure that the 3.2 V6 was available right the way through the production run.
The 3.2 was never the most popular option though, for many reasons:
- firstly this isn't an Alfa engine, its more GM based I believe. It replaced the Busso V6 you'd get in the old Alfa GTA 156 / 147 which was an Alfa own and much loved by Alfisti, so to have it changed wasn't popular, different noise, characteristics etc.
- the credit crunch was in full swing during production of these and fuel prices had risen dramatically since the range opened, so no one really fancied the fuel bill, add to that the fact it is 4wd can reduce economy further.
- it is in the top tax bracket as well, so annual running costs are greatly increased.
The Q4s in general are fairly rare. You can get them in the 2.4jtdm model too.
Most people who bought these and wanting some grunt skipped the Q4 altogether, ran straight for the 2.4jtdm in normal FWD, ticked Ti spec (sporty spec) and went for that. it has 210bhp but easily maps up to around the same 250/260bhp as the V6 but has better toque, better MPG and actually sounds really good as it is 5 cylinder. So you might want to try one of them.
you've been looking in all the right places I'd say. just have to keep an eye out till they come up. Prices are fairly low. Alfa's historic depreciation continues in this range and V6s don't fetch huge sums because people don't want to run them and dealers are scared they won't shift them.
You just have to stick it out and see what comes up.
Incidentally if you do end up with a 1750TBi, check what gearbox it has before you buy it.
Some of them have the M32 GM gearbox, it is a bit of a lottery of what the 1750s had attached to them. if it has the M32 walk away and find one with an F40 box on it. F40 is same box as the 2.4jtdm and is solid. 1.9jtdms have M32 boxes as do the smaller petrols. smaller petrols don't suffer so much as theyre non-turbo and no torque. 1750 is turbo and so torque can harm the M32s.
Good luck with the search.
1999 156 1.8TS Sport Pack 3
2001 166 3.0 V6 24V Super
2003 156 GTA 3.2 V6 24V
2005 156 1.9 JTDM-Jet Sport
2008 159 1.9 JTDM Lusso
1997 GTV 2.0TS Lusso
2001 147 1.6TS Lusso