Steering Conversion Early A body

You need a short "power-to-manual" column extender because the manual box is shorter, or an entire steering column from a manual steering car. Also if header clearance is a major issue, consider a borgeson u-joint instead of the pot coupler. Pretty sure somebody with a purple 65 did something similar, but for a slightly different reason. Do a search under Spitfire installation.

Beyond that, you need an early A-body manual pittman arm. There are aftermarket 16:1 boxes out there, or you could try to score a stock Formula S box. The aftermarket boxes have a grey iron housing instead of aluminum, but they bolt in.