"Pretty sure that it is a Bobsy SR2 following the Porsche Abarth. "
 

(11-4-13)  From Gary Horstkorta, Historian for the SF Region of the SCCA:

"#33 Porsche - J. Wellington / #98 Bobsy Ford - Chic Gast."
 

(11-9-13)   From Rich Blackmarr:

"The May 7-9 1965 Laguna Seca Regional/USRRC race program shows as entrants in Race 4 (CDFG Modified) both Jim Wellington of Campbell in a No. 33 silver DM Porsche Abarth and Chic Gast of San Mateo in a No. 98 yellow/black DM Bobsy-Ford."