Do I actually need a tune (or a VEC1)?: 96 GTS heads/cam 511 whp (but then there's 675 nitrous)

[Tom and Vipers]

According to Roe website info for Calibrator in 2001: OE tune at high load is excessively rich (11.0:1) with little timing (18*), low and midload, lean and lots of timing (45*)

Cam: 224* @ .050, .550" @ valve, 114* LSA

 

[Old School]

According to Roe website info for Calibrator in 2001: OE tune at high load is excessively rich (11.0:1) with little timing (18*),

An interesting result of doing anything that results in more air flow (heads, cam, exhaust, etc) at wide open throttle is it will go leaner because the same fuel is being injected in spite of the additional air flow. It's running in open loop mode and just using a predefined fuel map. This will get you closer to the desired 12.5-13 AFR without any tuning. Won't help with the timing though.

If it were mine, I would tune it.