Turbochargers

Got to ask as the Garrett folks seem to be ignoring me. Anyone have any of the old data sheets or charts for A/R on older Air Research T04 series units.

My old Allis has a T0448 p/n 408270-3, been scouring any and all sites with similar setups for Allis and close is all I get but nothing defined or cross reference confirmable. Can get a decent priced NEW from Steiner parts is a T04B80 but have no clue if too little or too much boost or lag.

Turbochargers