Yup, BTDT and would never turn back
I vote for the 3.6 as a better platform... easier to extract more HP at less boost. It also has the nice twin plugged heads/ignition already there. No need to spend a few $K getting that done on the 3.2
You can single turbo the 3.6... it just takes a bit more clever routing of the charge air pipe around the twin dizzy to make it work, but it's not impossible. Just use a good fabricator to make you the pipe
It'd be much cheaper than a twin setup that's for sure.
Depending on how much boost and power you want to make, you will be able to match a turbo to your application. If you are after sub-600H power levels, the GT35R is an awesome turbo and on that 3.6, it will spool freakishly fast
Of course you have other options, like KKK, PTE, Turbonetics etc...
3.6 pistons have a lot of meat on the piston crown... have them machined down for a lower C/R and boost away
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition