I'm running the xr4 in my car it runs great. It also has good street manners. I have times and the rest of my combo listed in my sig. I think it will go faster I ran out of fuel pump and injector.
Yes I think a 3800 will work fine I had a 3800 and it worked but was a little too tight on the shifts so Dusty suggested loosening it. We think its because my car is so light. My rpms are 5700-5800.