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Do you have a Kragens where you live? They sell longblocks for $1188.00.Just recently put one in a truck replaced a 360 with a 390.The total cost with core charge was 1609.00 but got 200 back when turned in core and that is with additional warrantee of 5 yrs 50,000 miles.I asked him today and he said it runs strong. Came with a melling HV oil pump also. Hope this helps.
Couldn't you just get it rebuilt locally for about half that? I noticed in a spec sheet that the 360 and 390 have the same bore. The blocks also look alike. I'm guessing that the only thing different is the stroke. Maybe longer rods and/or different crank. I thought you could get these things rebuilt for $500-600.