indy block question

wesw said
i'm sure you will need the RB block to use 4.500 stroke crank. 4.500 bore and 7.100 rod to get your 572ci. B1 heads you will have no problem making 850 to 1000 hp. the B1MC head 572 i had made 1050 hp. wes

thanks wes. does the rb really take up that much more space? i'm thinking i'm going to need custom headers anyway...