I plan on getting the Sniper 4500 but was contemplating just getting rid of all the old ignition setup. The engines are 1990 so figured might be good to replace ignition components along with all the fuel upgrades needed.

Holy smokes! way beyond my skill level with a welder. Guess I will just stick with carbs

Not that hard at all for someone familiar with TIG welding. And Eddie has the process down perfect.

I’m going to run FAST’s dual channel AFR meter. It’s a little over $500 with 20-foot cables. Being able to see what the engines are doing in the boat is important to me. Next year, maybe FI so the bungs will already be there and ready.

It can only “control” the HS ignition. And even with that it’s not doing active management. It accepts your inputs and adjusts timing based on the RPM/advance settings you created. Similar to MEFI but it has no way to retard timing if it detects an issue (no knock sensor input). That’s my understanding as it was explained to me last week.

There are some workarounds but they’re not supported by Holley.

LOL
I took mine to welder and picked it up a few days later , but if you can`t handle that then yes stick with carbs.

Just the Holley hyperspark ignition ?

You have a link for the documentation ? Thanks.

Here's a link to the installation manual:

https://documents.holley.com/199r11031r.pdf

A quick look shows that it can control a MSD magnetic pickup distributor with CD box after locking out the advance (duh) and installing an adjustable rotor.

That was not what the EFI System Pro told me.

Probably just a sales-related comment because I had mentioned that I wanted to stick with my distributor. He mentioned the plug and play Hyperspark system though the documentation only shows Dual-Sync.

The installation manual does not really go into deep timing control.

More info and resources here:

https://www.holley.com/support/resou...Fuel_Injection

I appreciate all you more knowledgeable people discussing this so i can try & follow along.

Okay , it says you can use sny magnetic pick up dist. Which the small cap hei/EST/voyager GM/Mercruiser distributor is.

Also says other (than Holley’s) hall effect distributors may be able to. So, possible the Merc IV:V dist could to. Obviously timing module eould not be used. Proof would be in someone trying.