3 Rib?

yes it is a 3 rib block. 7 rib blocks have more ribs running down around the welsh plugs, and some running across the block. They are the same in regards to fitment, they are identical, just not as rigid. If your car is n/a, you wont have any issues unless you were dreaming of 10, 000rpm+, as it will not do your crank or main bearings any favours. if it is a s/c engine, it should be fine, and high power turbo applications you would be best finding a 7 rib block, or sleeving the 3 rib and getting a main cap girdle from mrp.

how regularly do you want to turn the engine to 9500? if very regularly, dry sump would be required. if not very often you maybe able to get away with a wet sump using smallport oil pump.
 
there is a good thread here about getting revs/power out of a 4age. 
 
http://www.toymods.org.au/forums/tech-conversions/78846-how-high-can-16-v-engine-revved.html
 
xero is a good guide on that one, he knows his stuff and his engine is golden. but still he has spent thousands $$$$ and only really makes 119rwkw. I know the head porting and oversizing cost him a few grand.
 
this is all based on a 42mm crank though. Billzilla seems to think the 40mm crank is also quite good, will hold upto about 10,000rpm, but the oil system fails first. there is also speculation that the 40mm in the 3 rib can make the revs easier than the 42mm due to lighter components and less friction due to smaller surface area of the bearings etc. but I think that is just speculation.