going efi

[BLACK85GT]

well, when i was doing research to making a non ho block into a roller, i found that i had to buy a special retro cam with the proper journal sizes. dont remember the exact sizing off hand, but i know i could not just put in a stock ho roller cam.
As far as years, if the block had a roller cam in it from the factory, then you can obiously replace it with one. If it was non roller from factory, then you need the retro cam.
I believe 85 was the first full roller motor, but the cam could have been introduced as early as 82? Not shure on that one.
Also one more thing: The lifter valley of the non ho block has to be machined to accept the roller lifter setup. The area where the guides sit need to be flattened. I am pretty shure on this cause i am looking at both blocks in my garage now.