I see no reason it would not "work". However I am not sure how durable the setup will be as hot as the coil packs will run in that location. The airflow will be very low in that location and in addition to the heat the coils themselves produce, they will also receive a good bit of radiant heating.
Electronically they will however work fine, IMO. Due to lack of clearance batween the valve covers and body of the Express van, the D585 coils on my L31 are on a plate that I fabricated to cover the rear portion of the L31 marine intake and distributor body of the L31. Coils connect to the spark plugs via an OEM set of L31 plug wires. Very similarly to how the DIS works on a newer 4.3 V6. In fact the 4.3 setup is what inspired me to do my L31 that way.
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