It Is What It Is, Dude
Cool writeup but I agree that it says nothing about the 3.5 being a short-stroke 4.5. It does hint to the fact that the 4.5 is a later variation of the 3.5.
That all gets me thinking... Aren't the heads and intake manifolds from a d-jet 3.5 and 4.5 interchangeable? That would mean that the top end of the motor needs to be identical. Do they have the exact same bore? Is the 4.5 stroke longer only at the bottom end of the engine? Or maybe a totally different angle?
I did like reading the writeup.
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It's been posted here and elsewhere that 3.5L cylinder heads have been installed on a 4.5L block resulting in higher compression due to the smaller combustion chambers. Given the obvious block differences as per electro's pics, which would make the span between the heads wider for the 4.5L, the intake manifolds will not interchange, you'd use the 4.5L D-Jet components on the 3.5L heads.