National Marfan Foundation:

McKusick Fellowship Program: Two-Year Fellowship Awards in basic, translational or clinical research in the field of Marfan syndrome and related disorders are available for Ph.D.’s for up to $50,000/year and MD’s up to $75,000/year. Fellows up to post graduate year 6 will be considered. The applicant will be required to work with a mentor who can provide a training environment conducive to beginning a career in any of the disciplines related to Marfan research such as cardiovascular, orthopedic, ophthalmologic, pulmonary and genetics.
http://www.marfan.org/mckusick-fellowship  
Early Investigator Program: financial support for early investigators studying any or all disciplines involved in Marfan syndrome or a related disorder. Three two-year grants for $37,500 per year for a total of $75,000 per grant are awarded for basic or clinical research.
http://www.marfan.org/early-investigator-program