How much of a improvement would a 351w be down low? Also how much would you recommend paying for one that needs a rebuild? Also would i beable to use the same engine mounts that i currently have or is (like you would be able to with a 305 chevy and a 350 chevy) the whole engine a inch wider and not just the deck?
Big improvement down low. You will be very happy.
Going price for a "rebuilder" shouldn't exceed market price for iron, which should be comparable to a SBC.
Same mounts. It is essentially the same engine with a 1" taller deck on the block. This means that the heads are interchangeable, but the intake is different.
If I remember, the overall width difference is 1". If you have plenty of room inside your fenders now, you should see no issues withe the swap. This was a very popular swap for the 302 in early Bronco's and it shoehorned in with no modifications.