They look like factory 8 cly. front motor frame mounts. So a 283 would be correct. For the 6 cly. ,you need these mounts. I`d keep the flywheel(resurfaced) replace clutch etc. Also a rebuilt 283. With a borg warner OD with 3 speed floor shift.
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~ BD.
"You won't find me in an old folks home" Pioneer Florida Cracker
1958 Apache Stepside
1958 Apache 1/2 ton Panel
1959 Apache 1/2 ton Panel