Results for 1968 claim a Ford engine, but an online foruim has former drivers in the championship who claimed it was originally built for F2 with a downsized Alfa engine of 1000cc, then fitted in Canada with an Alfa 1570cc twin-cam. This seems to agree with your date of 1967. Typical of the Italians to fit wire-wheels when everybody else used alloys.
A photo from 1968.