Is it a big block? That would make all the difference in the world. Remember the hood is GS only and so is the grille.
A 455 1970 GS is one of the fastest muscle cars EVER. A Stage I verity ran around 13.50s at 105 MPH!!!
If it is a 350, it still could be worth it, depending on condition.
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Life long Buick fan,
1965 Gran Sport Conv.
1965 Skylark H/T
1948 Chevy P.U. with 401 in it.