I have for sale a Bob Book BRX-Jr twin blade carb. Will fit 4150 or 4500 intake. Was $2550 new from Book 10 years ago! I will also include a few pieces, the throttle cable bracket and a spacer for a 4500 intake if you want to use it. It was purchased to try and run NSS classes but out here in the west they don't care. So I no longer need it. It was on a 540" B1 and ran in the 8's with this carb and a pretty "mundane" bracket engine. It is a trick piece I just don't see myself using it anymore. Has very little use on it now, I kept it more for the novelty of running it. I would say it has under 40 passes in its life. Ill just run my 64 in brackets and S/C out here. My loss is someone's gain. PM me here, text or call me at 7 zero 7 9 8 zero 2 one 67 or email me at b1valiant@hotmail.com. Asking $1000 OBO....