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Thanks for the replies thus far. The car is a 1972 (not Calif) so I assume it is the 80HP version. The heads were replaced by a former owner less than 10k miles ago and are also in great shape so we are not going to modify the valves. About the only machining being considered is for the larger cylinders if we decide to go that way. I will checkout the type IV forum to see what real gains are available.
Thanks
Jeff
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