bearing clearance for std. oil pump with some rpm?

I am building a 408c stroker for a street car that will only occasionaly see the 1/4 mile strip. I will try to keep max rpm around 6200, but no more than 6500. I am going to use a std oil pump instead of a hi-volume. How tight can I run bearing clearances using a thinner oil like 10w-30?

Thanks,
Tom