Is this for the car in your sig?
The main difference between those two turbos (6031 and 6076) are turbine wheel. T-31 stage 3 for the 6031 and P-trim for the 6076.
Question.
Your Vigilantie converter, does it flash stall to 3200 or do you have to push hard on the foot brake to get 3200?
If it will jump to 3200 from a flat foot punch, the it's enough to spool up a 6076 decently. If it's slow to come up to 3200 on a foot brake, you will have lag trying to spool a 6076.
I took a 6031 dbb turbo to a best of 11.72's @ 114 on a stock 93k mile motor with only these parts: New valve springs, double roller timing chain, RJC power plate, good fuel system, stock location PTE intercooler, 3" THDP and 2.5" dual exhaust. I was running 26-27psi of boost, C-16 and launching off the E-brake. The car had a 10" 3000 stall Pats l/u converter.
If you want low 12's - high 11's the 6031 will do that all day long with 25psi and supporting mods. The 6076 will free up some back pressure at higher boost levels, but it will need more stall to get it moving/spooled up.
Honestly, I think you would have more fun with the 6031. (aka TE60)
New models tho, would be a toss up between a 6262 and a 6265.
Hope this helps.
Patrick