Hey John, nice looking car. Is it possible that the engine has shifted over on the mounts and the exhaust pipes are hitting on the sub-frame under acceleration? I have had the twin carb linkage hit on the top right sub-frame on acceleration also.
On a separate topic, is that your car in the picture? If so, how is it that the judges didn't question the eared knock-offs on smooth center hub wheels & the covered headlights on a 1968?
Cheers Tom