Roller Block Cams?

Max1196 said

The snout of the cams will be different (where the cam gear and fuel pump eccentric would go). The length of the retrofit cam will allow for the use of a fuel pump eccentric where as the EFI cam snout will be shorter and no provisions to have a fuel pump drive, without an adaptor.

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No, the LA roller blocks used long snout cams and were capable of driving a fuel pump. They came in both feed-back carbureted and TBI versions, but used the same style mechanical fuel pump capable camshafts. It was the MPI Magnum engines that started using the short nose cams.
OP, the retrofit cams will work just fine in the roller LA blocks.