1929 american lafrance firetruck need help

[Guest lh3359]

our volunteer fire department has its first fire truck but we have a problem.the intake and exhaust manifold have several crack in them,the carb is wore out and has crack in it and our fuel pump leaks bad.i dont think this is orginal engine because it has a buick in it. the tag on the engine says BUICK model #29m engine #29mr16704 date 9/25/40. my questions are did this engine come with a updraft carb and manifold or is this something they used from the orginal engine? we need to find parts but we dont know were to start looking any help would greatly be appreciated.