If you bore a 389 block .058", you have a standard bore 400.
Same 3.75" stroke.
Early 389s had a short crankshaft snout. Make sure that yours is long enough for your choice of harmonic balancers.
Sonic check it before boring, obviously, but most 389s are plenty thick.
Use 1967-up heads so intake manifold choices and valve sizes (2.11/1.77) are better.
We've done two this way and were VERY happy with the results.
Besides, FREE is good!
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