Yes.
Look through the photo sections of the SCTA-BNI and the ECTA web sites and you should come upon a photo or two of car #3232. It runs a bike motor in an early coupe in the Competition Coupe body class.
Depending on weither you are running gas or fuel - blown or unblown - the classes would be . . . I/GCC gas unblown, or I/FCC Fuel unblown, I/BGCC gas blown or I/BFCC fuel blown. Upper limit on I class is 1000cc
Get a rulebook and read it till you go blind. Then read it again. Then ask questions. Then ask more questions. All part of the fun.
