No, actually.
1) His build of a Grand Prix requires a Slim Jim RotoHydramatic, not the big Hydramatic.
2) The B&M conversions most typically used the earlier Hydramatic cases with removable side covers, as are in all the kits featuring them.
The Super Hydramatic, which would be correct for a Bonneville or Star Chief, has an entirely different case with no removable side cover.