i'm in the process right now also. I think in 6 months their will be a lot of us with 351w rolling. The problem that i have with the engine manufacturers is they use retro-fit lifters, they just convert a non-roller block
I have been weighing the options:
Keith Craft: 5695+shipping
351 sportsman=1200
AFR 185s=1500/with upgraded springs
Stroker kit=1200-1400
Intake=400/bought a used 351 Trickflow of Ebay
Custom Cam=300
***4750****
Now granted you have to by a ARP bolt kit, roller rockers, oil pan, and a lot of little things but this gives you a solid sportsman foundation, a custom cam to fit your needs and a good stroker kit.
just my .02 cents
nathan