it sounds like it's not much work then, to stuff an A518 in the tunnel. i'm being sort of a [thread] "jack", so if a B-body's tunnel is sort of close, a 518 will work there as well. [thinking of my charger]
you are correct. an A500 is based off of a 904. however, the overdrive units are the same for both, with exception [i "think"] of the diesel A618 unit. [PLEASE correct me if i'm wrong on the overdrive units, guys ! ]
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