Well I'm not going to discourage you from trying that swap because I think it would be kinda cool!
I'm not sure if the earlier v-6 mustang mounts would work because I doubt that they were the same block. You may have to fabricate some. Also make sure the oil pan will fit with whatever K-member you use.
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Good luck!
Brad R.
1992 L.X. 5.0 coupe
MODS: A few little bolt ons
New Best time ...11.60 @ 128 mph @ 2000+ ft altitude.
Rice Haters Club member #39
Users rides #2542