351 swap

[red82gt]

A stock 351W is nothing special aside from the one in the 95 cobra R. That one made 300+hp and 340 lbs/ft of torque. The late model (94-95) truck motors made 230 hp and 310 ft/lbs of torque with a rollercam. The 94-95 lightnings made 240 hp and something like 320lbs/ft. with GT-40 heads and a GT-40 manifold but were saddled with a very mild flat tappet cam. With just a cam swap, lightnings made an easy 30hp extra.
The torque curve of the 351 starts nice and early, but in stock form it signed off early due to poor breathing parts.

As for there not being many 351W parts, well, just about any 5.0L head will bolt onto a 351W, there are pages of camshafts available for these motors too, just as many carb intakes and a handfull of excellent EFI manifolds as well. This motor is going to make 15% more torque than a 302 with the same parts across the board until the top end, where the extra 49 cubic inches will have already used up the airflow.