Well, the one LT1 swap I've seen used the heavy, iron cylinder head LT1 from a Caprice/Roadmaster/etc. with a big beefy heavy old school 3-speed automatic. So you'd see some weight added there.
However, the Camaro and Corvette used aluminum head LT1s, and the Camaro has a very nice, beefy, not too heavy aluminum case 6 speed manual attached. Much lighter motor/trans combo.
Even better would be the all-aluminum LS1, which is also an all-new, more modern design all around.
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