going to order the hsr intake and rails and just wondering if i can go with the cheaper rails with the non adjustable fpr will the kirban fpr match up to those rails or do i need to get the rails with the adjustable holley regulator and then swap out...

the rails need probably to be holley, cause of the mounting. the fpr should be interchangable, but I would personally just spend the money and get the holley parts, you might regret getting cheaper part in future.

The rails are identical ; the only difference between the two kits is the type of reg supplied.
And many have had problems with the Holley adjustable reg