HP / 0-60 correlation?
 

If a stock w123 240D auto does 0-60 in 24 seconds with 67 HP
a stock w123 300D NA does 0-60 in 15-17 seconds with 88 HP
a stock w123 300D (T) does 0-60 in 13-15 seconds with 125 HP

how much HP does my modified w123 make with a 0-60 in 12 seconds?

135

That would be interesting to know. A dyno test would be the only actual form of verification. It's not linear since there are a lot of factors but based on the factory numbers my guess would be closer to 150.

dyno after I install the myna pump. Getting closer with help from IMBroke.

it depends on what you have done.
was it originally turbo? Differential gear change? tire sizes? altitude?
a mildly tuned 123 can achieve 12seconds. so you could be around 125 still