Will GM 200r4 work with factory floor shift location?

That's what I'm going to check in just a few minutes. Now that I've mocked up the engine and tranny together I'm going see how much the converter pilot engages the TCI adapter plate (bright red item attached to crank). I had to mate the tranny to the engine with the TCI adapter ring just to see how much clearance I had between the converter and the flex plate. To answer one of your other questions, the converter pilot fits very snug into the back of the crank adapter. Everything I read says that the flex plate does flex toward the rear and if you don't have to pull the converter forward at least 1/8" the converter can damage the front pump when the flex plate moves toward the rear under load. If you have too much clearance and pull the converter too far forward to get it to mate with the flex plate you run the risk of disengaging the converter from the front pump when gives you a different problem. So 1/8" to 3/16" clearance is recommended for GM set-ups. Will have pics on the issue later.

Treblig