I have been helping a new gbody owner with some upgrades. First its a 87 El Camino with the 200R4 trans. Motor is a vortec 350 with a cam headers carb and HEI. Wanted to change gears but was told that with that trans the shift points will be way off. So the stock tires are 195x14s and I want to up the tire size to 215/70/15s. Not sure where the shift points are right now (its in storage for the winter) but it was a 305 with the 200r4 trans. Some one must know about where it shifts. (could use help with that one) Motor is a copy of the GM 350 Ram Jet so it make peak power to 5200rpms. Not sure what the rear gear is but wanting to know what or if the biger tires will change the shift point.