Byron , I found your web page and read about Seaport Automotive , I have a car that they sponsored in the late 60' s and early 70's.
The owner at that time was Jack Hannes, and the car was a 1948 Willys Jeep wagon with a chopped top , I bought the car 33 years ago.
When I bought it Jack said it ran in C/ D/ E/ GAS I will send pictures, some at Indy 1973 , and a local car show , I live in Auburn , IN.  I still have the car today.
Matt Cool