I would run a H/P HEI before using one of these, can get a decent one, complete w/coil cap etc, then get a vac advance block off and the 2 connectors and all for about $100 used many of them and work great...

No, your 2 plug coil/distributor ignition system tells the ecu when to fire your efi and the ecu determines the timing curve, cannot simply drop in a "old" style msd distributor in your case, Smitty

I hate the HEI look... and the marine ones I see are around 200.00 I am looking into a few things...don't want to see the vac advance diaphragm either...

These are what I ran on my stock 420's in my old Excalibur. I do believe the advance curve is fully tailorable to different needs. Stock they come with 24* of mechanical advance. The curve and total advance may be modified though.

http://www.summitracing.com/parts/ma...make/chevrolet


http://www.summitracing.com/parts/ma...a/instructions

Do you still need ignition box? Or are these self contained?

From the link.


Computer-Controlled Compatible:No

Trigger Style:Magnetic

Advance Type:Mechanical

Cap Style:Female/Socket

Mechanical Tach Drive:No

Slip Collar:No

Gear Material:Steel

Ignition Box Required:No

Distributor Gear Rotation:Standard

Distributor Cap Color:Blue

Housing Material:Billet aluminum

Housing Finish:Natural

Marine Use:Yes

Quantity:Sold individually.

In-Store Pickup:Choose In-store pick-up (OH, GA, NV) on our web site.

Replace your OE distributor with one of these modern, high performance marine magnetic breakerless distributors from Mallory. Their complete, self-contained ignition system combines the triggering device and amplifier into a single unit that sits inside the distributor housing. The self-contained module/pickup assembly has no moving parts to wear out, making them superior to many other designs. Their time-tested breakerless ignition circuit and surface-mounted, Thermal-Clad construction provide reliability in harsh marine environments. Designed for 12 V negative-ground systems, they improve combustion efficiency and spark plug life, provide accurate timing, and have a simple wiring hookup for easy installation. They're designed to work with both OE and aftermarket coils, so you're sure to find the combination you need.

Oh duh missed that

I have heard that you can run a msd pro billet dist without the ignition box and just use a gm hei module in place of the box. Does anybody have info. on this?