I used the holley swap system and had had to relocate that one coil. It was hitting the ac box. I ended up moving it closer to the next coil by cutting the bracket.
I had to modify the coil pack bracket to clear the air box on my heat-only 1984 Monte Carlo; my NGK spark plug wires are rather long compared to the OEM and could accommodate the longer distance to the plug. If I were doing it again, I would have welded two factory steel coil racks together in a similar manner. There are lots of pretty coil brackets to choose from (ICT billet, ebay, etc.), but they can be expensive.
The holley swap kit doesn't leave much room between the passenger head and the firewall, but this placement allows the truck accessory bracket power steering pump pully to clear the steering box. Holley claims their mounts put the bell housing in the same location as the factory original motors (SBO/SBC/v6), but you still need to get the driveshaft shortened if you are using a computer transmission like 4L60e/4L80e.
I was not happy with the Holley transmission crossmember, and the blackheart exhaust kit has been difficult. Some pieces were manufactured wrong (flared on wrong end) and it took weeks for Holley to make it right. I'm happy with it now after having it apart half a dozen times.