I’m not exactly clear on your question about the trans mount. Are you using Holley mounts? The same Holley 727 mount will fit an A833 so the Holley trans mount should work for the 4 speed without mods. But the Holley motor mounts move the motor/trans forward about 1.75” so the clutch arm mount and shifter might/will be an issue.
The issue with the top mount alternator is the intake. No idea if the 5.7 car intake will work, but for sure the car 6.4 intake will not. The truck 5.7 intake points the TB straight up and feels like it would be difficult to make a filter fit. The truck 6.4 is better, but still points at the hood.