Ididit column for 47-54

[PurdueSD]

Ive been looking at picking up an ididit column for my truck. Ididit's application specific column for my truck says its a 1" DD. From everything ive seen it looks most people use 3/4 DD. It will be connecting to the t-bird rack that came in my scotts ifs. As im sure you know itermediate shaft space isnt exactly plentiful on these trucks with a sbc. Anybody know what the deal with the 1" vs 3/4"s is?

Ididit part # 1120651020 is the one im looking at. It is no key and floor shift.
Anything else to consider?
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