Do I wait for the 5 speed?

Not specifically what you asked, but I was in the same scenario as you.

I decided on a fully aluminum Passon case 18 spline 4 speed, street slick shift kit, and a Gear Vendors OD. My parts have just arrived, I am about to start the assembly process.

I didnt like the ratio split on the Passion Hemi OD, and I was nervous of the A855 if anything ever went wrong.

I could have put on a new style OD transmission but I don't want to cut my 340 Swinger car.