Mort, do you have the 1L/4 speed, 1L/5 speed, or 1.3/5 speed?
The SJ410 frame and tub is identical to a later sami, except for engine and tranny frame mounts, and the
shifter hole in the tub is a couple of inches further back in the sami. Plus the frames spring mounts are
3.1" narrower overall on the SJ frame.
I was told the tranny mount will work between the 4sp and the 5 sp, but I don't know where the shifter
lands, or what the intermedate drive shaft legth will do. The U jounts will swap between the sami and SJ,
using different keeper clips, but the 4 speed yoke is an orphan. can't say what the 1L/5 speed yoke is, as
I haven't seen one, but I supect it uses the sami yoke.
The spring rates are 10% lighter on the SJ.
You will need the 1.6 harness unless you go weber, the 1L 410 ECM is an orphan
Hope that helps.