On the later EFI models you have to keep the OEM igniter and interface the MSD box to the system with a tech/EFI adapter.

That's what my buddy did to his 88 and it's worked flawlessly since.

Because the EFI computer needs a specific signal from the OEM igniter to set the timing and trigger the injectors, which the MSD alone can't do.

I don't know if any gains will be noticeable with the stock engine.

The MSD and alike are usually intended for modified/high compression engines.

The only thing you can say about having the MSD system on a stock engine would be your providing more than enough spark energy to ignite the air/fuel charge.

Chucky MoMo <img src="/forums/images/graemlins/wink.gif" alt="" />