Early 6 bolt cranks require a 3 bolt flexplate and converter.
Later 8 bolt cranks require a 4 bolt flexplate and converter.
Pump and pump drives don't interchange between early and late trans.
The later 1986 to 1989 3 speed is far superior to the early unit.
You'll no doubt want a non lockup Turbo version.
If you can't use a 1986 to 1988 crank you need a custom converter.
It needs to be 3 bolt on the flexplate side and 4 bolt on the pump side.
This is one of the oddity's we deal with when upgrading.
The later trans has superior larger inner spline axles.
Any K type car from 1987 to 1990 will fit and work well.
K type includes Daytona, Shadow, Aries, etc,
Anything but an L body or minivan.
There are several final drive ratios available:
2.86 ring gear and .91, 1.96 and 1.22 transfer gears.
Lots of great info here!!
http://www.thedodgegarage.com/
Thanks
Randy