I helped put an Alfetta rack on a 105 1750 Spider that we put a V6 in, as a LeMons car. A very modified, mangled car. We welded mounting tabs onto the bottom rear of the main crossmember to attach it. Had to combine the stock steering column with the shaft off the Alfetta rack.
With a stock four cylinder in place I don't know how the fit would be but we had a combined V6 top/105 bottom oil pan from APE here in Calif. APE headers too. Everything was a very tight fit.
Andrew