No offense, but if the LT1 car is a 6 speed, and has a good driver it will walk your 67 Z. My uncle has an almost stock 94 Z28, and it will eat my 67 alive. A friend of mine has the bolt-on LT1 record, an 11.70 @ 114. Granted, the car has been lightened up, it has a 12 bolt with 4.33 gears, roller rockers, cold air intake, and headers, but no other modifications have been made. A good driver in a bone stock LT1 should be able to run a 13.4-13.6 with good track conditions. My friends car making a pass.
http://lsx.streetfire.net/video/cfa3...6101222244.htm