[vector1]

alright bob, here is what i came up with preliminarily. i used afr205's, library didn't have the darts. estimated a lot of the cam data and made some assumptions on other stuff of course.

initial tq with your present setup showed 494@5000, 507 @5500. your present tb's flow 2779 cfm, best guess. this is using 2.25" length on tb's.

the preferred dia. of the tb's would be at 1.75", or 44mm, lesser so 46mm. length of the tb's was 8.25-9.25 using eap, i don't have pipemax here to give a preferred wave tuning but can do later. cfm of this setup is 1793cfm. using this setup tq was 570 at 4500, hp was 556 at 5500.

i'm not sure how the tb length is measured but have a question in to find out for sure.