4.6 SOHC into a 2nd gen. body
The SOHC 4.6 heads are very close in size(externally) as the DOHC 4.6.
I agree that the 2nd gen frame rails will not let the 4.6 go into our vehicles.
I have had thoughts of using the 5R55W(4.6 V8) trans behind my 4.0 SOHC. I gather that the bolt pattern is the same, but there are two other problems. There is a difference with the starter patterns, so a modified starter would probably have to be made. The biggest hurdle I found was that Superchips suggested that the two transmissions used two different PCM programs.
I thought that they would have virtually the same programming requirements, so I am not completely convinced.
I have had wishes to swap a 2nd gen. body onto a wrecked 3rd gen. chassis. I think that's the best possibility to get the 4.6 into a 2nd gen.
Take several measurements first. Keep us informed, and good luck.
DonW