[MikeP]

Hi Jyrki,
There are essentially two types of small block fords. The 289/302 (4.7/5.0 litre) and the 351 (5.7 litre). The bores are the same on both but the 351 has a "taller" block to allow a longer stroke. It also has much bigger main bearings. So if you want a high revving motor there is little point in destroking a 351 as you are going back to a 302 in effect.
If you want high revs you need a strong block with strong main caps suc as one of the Ford Racing race blocks with very solid castings and 4 bolt main caps. Use good H section rods, quality forged pistons and a steel crank. Use top notch stuff eg good race spec bearings and ARP studs and bolts. Use a top quality harmonic damper. Get a really good balance job - possibly an internal balance. Small block Fords are usually externally balanced - the out balance crank is balanced by an out of balance flywheel and crank damper. The revs it will go to will then depend on the cam, heads and inlet setup. You need to plan all this out bearing in mind what you want to use it for and how drivable it needs to be. On the road a full race motor is real pain. A good torquey motor is usually far better than a screamer unless you are on a track with the engine a high revs all the time. A good guide to performance is to look at the area under the torque curve rather the max power. Power tells you the max speed. Torque tells you how quickly you will get there!
Cheers
Mike