Yeah, with a 4.10:1 and the .67:1 O/D your final drive gear will end up as; 4.10 x .67 = 2.747:1 final drive gear. Not to mention that the 1st is a bit better than the TH350; TH350's 1st gear = 2.52:1, first gear multiplication will be 4.1 x 2.52 = 10.332:1 200R4's 1st gear = 2.74:1, first gear multiplication will be 4.1 x 2.74 = 11.23:1 So better 1st gear to get you going from a dead start and O/D when you're cruising. I can't remember the trans codes that you want to look for but they have been discussed before in the "juice box" section here if you want to try a search for a thread with that info? Why open up an engine that already runs good? I read in your other thread that you found out that the engine has probably been gone through before you bought the car. This could mean you might already have one of those cams you have listed in there already? When you freshen up an engine, usually the cam is replaced when its a flat tappet cam.
