Hi Shooter Boy,
I have just finished a full rebuild of my RB26.
However I left the standard crank in so i'm no help to you there although someone who has had a similiar rebuild but toughened up the head with stronger springs etc can rev safely to 9000rpm with standard crank.
I note you are going to use HKS con rods I assume they come with suitably stronger con rod bolts as this is a definite requirement.
Cheers