No, no BBC T70's did well.
The BBC was not a great engine in Can Am until the Reynolds aluminum block came out in the McLarens. By that time the Lola Can Am car was the T160 series
and the Lola T220 series
. The cast iron blocks added too much weight and the rpm range suffered as well. The Shadow Can Am cars had 1400 hp out of a Twin turbo Reynolds aluminum BBC but that motor was not around in 1966 and 1967 when the T70's did so well. Even if they had been, the T70 was never designed to have so much power. The T70 was the last of the Can Am cars that
were actually designed as a true Sportscar with two doors, two seats, headlights, luggage space, a horn, etc.
The McLarens had no headlights for example. By the time the 600 cubic inch cars were running they were essentially dragsters that cornered well. T70 spyders are worth more than McLarens today for that reason. They are sportscars that could be driven to dinner with a date.