Huh? Wha? Some one woke me up from my slumber. Yeah, the Spirit R/T... I think I know what one of those is. And you don't need to de-badge it because only a handful of people actually know what it is. The only way you get a challenge is if someone sees your aftermarket gauges on the pillar, the 3" exhaust with no cat and the "wooooshhh" from the aftermarket BOV.
The head does have a tendency to crack if you still have the stock iron plugs. It usually cracks on the third spark plug area. They are fixable if you know where to go, but yes they are pretty much irreplaceable. I don't know if anyone has put the Neon head on a TIII block yet. I know they have done it for a common block 2.2 though.
I would prefer to go with the SRT-4 motor though. They have been using this motor for a while now (Mexico) and it is pretty strong. There are no known issues that I can think of and parts are plentiful. I doubt that this motor is a fit for the R/T but who cares because the SRT-4 is lighter and faster anyway.
The Spirit R/T is a cool car for what it is and when it came out it was hotter than shit. No SHO or M3 could keep up with this beast. It had its moments but now it is pretty much been put out to pasture except for the old Turbo Dodge guys who resurrect them and make them run 12's. I'd settle for high 13's myself. Anyway, if you have questions or want to reminisce let me know.