nice score man! i agree with Jonboy... if you can get the tranny for $600 jump on it! and they are correct on the motor being a lq4. the big giveaways are the intake is from a truck, iron block, and the throttle body on ls2's is a different design.
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"Dennis the Menace"
1978 Silverado (2wd, 1/2 ton, short bed)complete nut & bolt frame off restomod LQ9/4L80E
MY LS SWAP/FRAME OFF BUILD BOOK
2006 TBSS way too much to list