Disappointed in my 383 on the Dyno

The 400 block also has a stronger bottom end than the 440 block. If you start really pushing the hp, the crank is more likely to stay in the block with the low-deck...
so i am getting a bare clock for 300 bored .25 but needs finish bore with main caps. Anything else i should have done prior to ordering a stroker kit from 440source?