I've got some oooooold holley carbs I got for free, one is from a '58 Edsel(thanks for helping me decode it!) 750 vacuum secondary that would actually be nice to use if I can rebuild it. Other is a 600 vacuum secondary. What should I soak these in? Is there any trick to removing these screws? The last time I rebuilt a carb eons ago I broke a float post trying to chisel the needle seat out of it and never got it totally broken down because I couldn't get all the bolts out. So! Is there a solution besides carb cleaner I can use to soak it in(molasses or something?) to clean it up after it's disassembled, and any suggestion on removing tough bolts? I think last time I also used an impact driver, which I don't recommend. Thanks in advance!