The HARRISON RADIATOR discussion can get very confusing for sure. This is a BF ( Fremont Assembly Plant ) truck. Which means it came with SMOG (K-19) originally. Which means it got a shroud. All Smog 66's would receive the shroud.
If this truck retains its original Harrison Radiator, it should because of the above also be a version of the HD 4 row Harrison Radiator aka as Hen's Teeth these days
There's more to the entire Finger Guard vs Shroud vs HD Rads story but I'm too slow a typer