4 Spd?

I am thinking about doing a 4spd conversion in my car, (bummer cause I just finished welding and painting the new floor pans) I have a F-body OD I was thinking about using. I am kinda worried about the 1st (3.09) to 2nd (1.67 maybe) shift and RPM drop.

Anybody using one?

What are your thoughts?

Thanks in advance,
JOE