I am about to drop in a 350 where a 307 and 305 once resided. the 305 had an HEI distributor with accel super coil and cap and accel 8mm(i think) wires. the module and rotor seem to be stock GM pieces. i plan on replacing the cap/rotor/coil and im wondering if i should change the GM module to one of the aftermarket pieces (MSD,Petronix,Accel).

heres the 350 combo

2 bolt block
standard deck height
.030 overbore
rebuilt bottom end (cast crank, stock rods)
Silvolite flat top pistons
stock 882 76cc heads
GM aluminium intake manifold

Comp cams 252AH (206/212@.050lift .425/440 lift 112 lobe seperation)

Hooker Competion Headers (full length)

the car will see daily drives at around 50-60MPH and many freeway miles that might get up to 70-80MPH. the car has a stock TH350 with 2.73 peg-leg. will see occasional trips to the local 1/8 mile track for bragging rights. (car may also see 3hr trips at around 70MPH average depending on where i go to college)

will i gain any performance (street or strip) from the aftermarket modules? if so, would i be okay with the Petronix module?

thanks guys.

While looking on the web for a performance distribuator I found www.performancedistributors.com (http://www.performancedistributors.com)
Looks like a good way to go if you want to take all the guess work out of timing! GIve them all your vech/motor info. For stree/strip www.performancedistributors.com/gmssdui.htm (http://www.performancedistributors.com/gmssdui.htm)

hehe, those are cool but all i need to buy is the module. thanks tho, maybe when i rebuild another 350 i'll drop one of those into it.

Enrique
If you have a stock HEI, stay with the GM module. I rather get a used Delco module from the junkyard than buy an aftermarket one from the auto parts store. Delco modules last. That's why you will see them in some of the junkyard cars. They still haven't failed. If yours works why change it?

IgnitionMan (is he still around?) recommended two modules for the HEI:
GM 990
NAPA TP45

Don't forget the dielectric silicone grease.

I'd go with a GM - Advance Auto will check your module for free.

As long as the stocker is good use it. I have changed them but always when the stocker died and I am not sure if it didn't run better with the stocker.

I also agree with the above posts in that you should retain the stock module as long as it works. I've seen the needle kiss the 7000 mark on my tach with the stock module. The engine hits 6K regularly and 6500 occasionally, and I've yet to see it weaken at higher rpms as reported by some aftermarket ignition manufacturers.

The best thing you can do is to replace the plug wires with some MSD 8.5mm SuperConductors. This helped my ignition performance more noticeably than any other hardware change. I also recommend getting a handle on the curve. There have been lots of posts on optimizing timing curves. A search should get you well on your way.