If you took the bone stock engine,added headers and a free flowing exhaust,a cold air kit and reflashed the computer it would probably make close to 400 hp..
thats pretty optimistic, but all are good mods to have, and after a swap a flash is a must to eliminate theft (VATS). And any time that you modify the way air is presented to the MAF (any non-stock cold air kit/filter) you need to adjust your maf transfer coefficients otherwise the car will not be accurate in how much air the sensor is seeing. it would run otherwise, but not as good as it could, and after all thats why we went to fuel injecto isnt it? Anthing after the maf (ie FAST intake or the like) doesn't matter, as far as tuning is concerned
Supposedly the truck intake makes good power but limits the options for accessory mounting in a passenger car..
The larger voulume is better than a ls1 intake for HP, but its use is constrained due to the reason listed, plus hood clearance in some applications
Adding a cam and cam kit to get it out of the truck tune up would really wake it up.
this WILL get you to 400 (with above mods) but the "truck tune" is really no diffrent that a "car tune" the engines are controlled to an A/F ratio and spark limit, with knock sensors and have short tem and long term trim "learning" offsets, just an FYI
If you want to go with a carb,it is a super simple swap the Edelbrock intake kit comes with an ignition controller that simply plugs into the factory coil wiring and harness and crank sensor and hooks to power.It is actually simpler then instaling a distributor.Using a carb would allow you to run a shorter duration cam but with shorter lobe seperation angle which woud really put some needed mid range punch in the combination,as well as an old school lope.The computer wouldnt tolerate the short cam centerline like the carb does.
Now the intake reversion can be nasty to tune, and a lot of tuners just cant seem to get it right, but a properly tuned injected engine will make more hp and tq all day long over a carb with ANY cam. Its a shortcoming of the tune not the system. Carbs hide many sins because they just run "fat" (rich) all the time
There are plenty of swap headers and oil pans for your car,it should be a bolt in job.If you are running an old school automatic,you will only be able to use 5 of the 6 bellhousing bolts,and the convertor may need a spacer to fit with the slightly different LS series crankshaft length. Good luck.
all good information, GMPP sells the spacer you WILL need if you run an old skool trans