Power Steering Gearbox swap

[Old MrB]

I've got a hairline crack in my power steering gearbox (1970 Barracuda) and I thought I'd replace it with one from a 1990 B250 Van (in my yard).  The problem(s) are - different output spline shaft diameter and a drop in the overal movement of this shaft.  Mine has an overall turning radius of about 90 degrees.  The one from the van seems to only turn about 30 degrees.  Then I thought I'd swap out the guts so as to use the 'core' or case but taking it apart is proving to be a real challenge.  Can I purchase a rebuilt unit (where) and just eat the core charge?

[Bullitt-]

Yes.... Found this listed at NAPA

     Item#:  NSP88277097

Price: $139.00
Core: $66.70

tax and shipping not included

Disclaimer: The stated price may vary from the in store price and may change at anytime.


Attributes:
Features & Benefits:100% Hydraulic Tested. Guaranteed Performance Every Time.
Features & Benefits:100% New O-rings And Lip Seals. Ensures No Leaking And Quality Performance.
Product Features:Cool Dip Finish. Rust Inhibitive Penetrating Dye Allows For Complete Coverage Of Exposed Surfaces. This Finish Will Not Crack
Flake Or Peel.
Line Thread Size:1/2 X 20
# of Mounting Holes:3
Input Shaft Diameter:5/8"
Output Shaft Diameter:1 1/4"
# of Turns Lock to Lock:3 1/2

Or you might want to upgrade to a modified unit
http://www.steerandgear.peachhost.com/ct_CGchryslerremanufacturedmanualsteeringgears.htm

2053-Firm Chrysler Power Steering Gear - 1972 & Down - 1-1/8" C/S

Firm Chrysler Power Steering Gear - 1972 & Down - 1-1/8" Sector Shaft. If you want that stiff feel and faster response, this is for you. Your steering will have that feel of the road, but without great effort. You will experience just the right combination for highway, road handling or drag racing, yet razor-sharp. And there's plenty of assistance for parking maneuvers. Painted cast-iron grey. Price includes $100. refundable core deposit.

Price $ 385.00    

But there are plenty of good used units, post here in parts wanted.