is this a good combination or am i looking for trouble

I'd look at some headwork, a light porting at least with some better valves than OE to wake the heads and power up, Proper stall speed for the converter. ( Thius is where I talk to pros)
(Easy there Mullinax, I think it was more of a joke on the cheifs behalf.)
The 3.91 with a tire not more than 28 diameter. (hich is tall IMO, I'd look at 27 -26 inchs myself.)
A smaller cam, 1 step down is about what I would also do.