I am in the process of SLP intake install with new injectors on my 91. I am also in the "while I'm in there" mode and along with other items I ordered a replacement MSD distributor from Summitt Racing. It came the day after I ordered it! Wow - fast service!
I ordered it on line and saw that it specifically fit the VIN "8" 91 Corvette. This is the L98 and not the LT5.
I have not had time to look at the direction sheet that came with it but I see by looking at the box before I left for work today that it has an adjustable vacuum advance on it. The distributor I took off the car does NOT have an external vacuum advance canister on it. Did they send me the wrong distributor? Or do I just connect a vacuum line to one of the openings in my intake manifold (maybe with a "T" to an existing line?)
Still at work and this is bothering me. Maybe the directions that come with the MSD will tell me what to do.

The LT5 was a lost spark system... no distributor!!!

It should looke identical to what you have, so I would say they shipped the wrong part... shocking... NOT.

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If it has a vac can ;totally wrong
Computer controlled dist for yours has large 4 wire plug out of dist base which reg HEI ( vac advance or not ) don't have

[IMG]http://i171.photobucket.com/albums/u309/vetteoz/electrical/DSCN2599_ezr2.jpg[/IMG]

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That is what I needed to know. I will go out to the pole barn and open up the box and look at it.
Thank you!

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They shipped what Ron ordered but, it's easy to miss that that distributor had a vacuum advance unless you really look over the part and description.

Can Summit make a mistake, sure so can all the parts houses.
Summit has 50+ damn distriburors listed for a 91, half with vac, half without.

Jegs - 25 distributors listed for a 91 again, half & half.

MSD website says - No distributors available for a 91


Ron, I'd call or email the MSD tech line. I've gotten very good service and quick answers from them. www.msdignitions.com .

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The only computer control compatible ( full electronic ) dist MSD makes that I am aware off is the MSD # 8366
A small cap remote coil dist identical to the one used in F-Bodies L98's and TBI trucks

[IMG]http://i171.photobucket.com/albums/u309/vetteoz/electrical/msd_8366.jpg[/IMG]

Traded my old distributor in to NAPA for a rebuilt one. I also added an MSD cap and rotor and an Accell coil. I have to take the cap back as they gave me a clamp on style instead of a bolt down style.
I will be leaving the Tpi cover off now as this will show prettier.

Yeah, don't trust Summit's catalog as far as you can throw it. I always verify with the manufacturer.

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No need to, just clip off the clamps and use the screws of your old cap.

good luck making that accel coil fit.