I agree with most of the posts that have recommended staying away from Nitrous with the TBI. Not saying it can't be done with the help of JET Performance, (Custom computer), and a gazillion dollar supplementary fuel delivery system, but it could get very expensive very fast. 1/2 the money could be spent building a stout 360 TBI motor that would put up some pretty impressive hp and torque numbers.
I just installed a custom built '90 360 TBI motor in my '90 RC. I've been planning this for a couple of years and have done a lot of research.
It all started with me building up a 318 TBI motor, (With everything available I could think of to make it a hotrod.) Headers, TBI adapter plate that allowed me to run the TB on an Edelbrock performer, .443 Magnum roller cam, (Mopar Performance 300 hp service cam and lifter kit), headers, dual exhaust with hi flow cats and mufflers and K&N air filter. Later I added 360 injectors and a SBEC computer from a 360 1 ton pickup, (1990).
The performance improvement was phenominal in the 318, with just the addition of the 360 injectors and 360 computer!
I've since installed the new 1990 366, (.030 over 360), with 2.02 SS valve heads, gasket and port matched to the same Edelbrock Performer intake, using my adapter plate. I installed a 50 state C.A.R.B. legal custom ground Crower roller, .456 / .466 lift, (advanced 2 degrees), and 9.6:1 hyperutectic pistons, and the stock 360 TB. The motor dynoed at 355 hp and 400+ lb of torque, all at a user friendly 4800 rpms.... The computer is from the stock 360 1 ton truck I mentioned.
This thing is a beast! When Crower machined the cam, I had them add the length to the front snout so I could install the older style eliptical for a mechanical pump, (if ever decide to run a mechanical pump and carb), however I will run the TB to get through emissions. I mounted the O2 senor in the driver's side collector via a weld in bung ftg. from Jegs.
I kept the 318 TB in case I need to de-tune it and lean it out if I have any problems passing emissions with the 360 TB, here in MD.
(Incidently, I have pictures available of the side by side comparrison of the throttle bore sizes between the 318 /360 TB's. Big difference.) I'd be happy to post them or email them to anybody that is interested.
I'm running 8.5 deg. advance for break in and right around 35 deg. total between 2800 and 3000 rpms. This thing really storms! (I'm running 37" SSR's and 4.56 gerars.)
The trans was built to Cummins specs; (A-518), using an ATI fully rollerized 22-2300 rpm stall speed convertor.
I just wanted to let you guys know that these '88-90's TB motors can be made to run, if you're willing to get a little creative.
My next improvement will be to up the fuel pressure a couple of psi, (once I find a compatable aftermarket regulator or figure out how to mod the factory one). (Ideas or suggestions would be appreciated if anyone has done this already).
Let me know if you want to see any photos for ideas you guys could use, if you're interested.
This got a little long, but I felt it was important to give these TB equipped motors the credit that they're due.....