I have a 63 Catalina with a 389 roch. 2 bbl. It had the exhaust replaced in 89 by the PO and it is rusted and leaking. I'm wanting to go dual exhaust would 3in be too big? I am wanting them dumped at the rear axle and was priced 250 that seems high what do y'all think. The carb choke is not working and I think the carb needs to be rebuilt it is pretty hard to get the car to start and idle at first, it wants to die no matter how much I pump the gas. It will do that the first 2/3 times I try and start it which makes me have to work the gas pedal for a few minutes before it will idle. I have tried to adjust the idle screws and they are adjusting it a little and I have gotten it a lot better than it was but its still got a pretty good shake to it as it idles. As far as I know the engine is stock, I have a Holley 6379 I would like to put on but with all the adjustments it takes since it has a slim Jim I am hesitant to remove the old carb to even see if the Holley will work. Does anyone have experience with these old 389s and where I could find a manifold adapter for the carb if I needed one? One last question I have is the stance on the car could be improved with raising the rear a bit, I know getting the rear leafs re-arched is one way to do it but is that the easiest/best way to do it?