stand alone fuel injection, forged pistons at CR of 9.0. I'd say about 600 HP or so, before something like a con rod would twist out of the block, or a bore would cave.
Now how long could that power be applied? I'd think one autoX would melt the engine as the thermal load is too high, and I don't know if this engine has an oil jet piston cooler.
All trade offs, a turbo 1.8 VTEC street driven by me, blast on the weekends 40 1/4 mile runs a year. 350 HP say for 4 to 5 years and around 50K miles. Forged everything of course. Add 100 HP to the setup, would cut that by 1/2 to 3/4. One of the bearings would lose crush or the wall would cave (even sleeved) or a valve would over heat and drop into the engine. something.
Back to the V6 pure street 100K miles, forged pistons, good rings, good tune, don't beat on it like you stole it, and and intercooled setup, 350 to 450 HP.
Beat on it every day, stock pistons, 100K miles err um 250 HP.. :scratchhead: OK maybe the 6 PSI and 320 HP mentioned above... maybe. Depends on the tune.
I got zero experience with the Mopar ECU, but I can tell you in general that modern closed loop ULEV ECU don't like boost, and there is a rather abrupt transition from closed loop steady state, good smog, good MPG to open loop power mode. Honda guys have for many many years now always gone back to the OBDI ECU older than 1996 as they are just easier to map and for the most part never even look at the 02 in closed loop mode, ie close loop mode is for idle and maybe 1/8 throttle positions or below... other than that it is open loop all the way. Like I said take it with a grain of salt, but most NA ECU don't like boost if you are talking just normal driving, the transition from NA and light boost to medium or heavy boost... drives um crazy.
Ford is getting some really good longevity numbers with the V6 ecoboost:
Ford Demonstrates Ecoboost V6’s Reliability in Detroit - The Car Guide
For numbers sake a solid 350 HP from 8 to 10 PSI of intercooled boost, good tune, forged pistons, 3.92 posi rear, high stall in a 5 speed, you would be slightly faster then a R/T bout as quick, and the build would cost about $10,000 to $15,000. Just round numbers.
For my money might as well look for a Supra engine 2jzgte and getrag 6 speed, you would see an easy 100 HP to that number and the sky is limit on the engine itself, the limit being the budget. fast and furry Tokyo drift style, upgrade the rear to a 3.92 posi and 216 mm axles cause the stock setup would blowup on the first run.
http://www.suprastore.com/2jzgteengine.html