I have done 2 1984 phazers, i move the front mount back 2" and 1" down and built new drop brackets. this will get you to be able to use a 121 to 136 extention, WPS sells a tunnel ext to get the job done.
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Aerosled were the 8 t ooth drivers the stock ones you used when you installed the 1-1/2" lug track?
Where do I find information about this bushing upgrade ?Put on a new belt, otherwise new springs and weights.
Might check thread on upgrade from YVX spider (3white nylon to 6 black) as on more current bushing,
or just rebuild what you have as there are several springs and weights to choose.