Preferred Transmission question

I have a 833 I installed in an overdrive alum. shell. Not in use. It has the larger front bearing and I had an alum. bellhousing milled to fit. Can you use the OD gear and are 1-3 gears available that would stagger the rpm's more evenly? I know Passon sells a kit but starting at $3475. is steep for me. I don't know what gears are compatible or available.