I own an 86 fleetwood with the factory 307 olds.It almost goes without saying why I want a little more power. QUESTION A. I understand the bb olds with bb mounts is a clean (semi!) swap . Is this true ? QUESTION B I have the option of several 455 engines ; an olds in av. condition and 2 x pontiacs --these two are better condition engines --are the pontiac engine mounts the same ?? Any sage advice would truly be appreciated cheers mike