it'll line up but you will need the 81-87 mounts though. IIRC... your making me think!
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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