I'm building the following and wonder what folks are running on the street for jets and how they're setting their MSD distributor up. I've heard back from a couple and one suggests 72 and 78s and the other is running 74 and 80s with the brown secondary spring. The carb came out of the box with 70 and 76s.

396 bored 40 over with approx. 10.00:1 pistons
Edelbrock Performer RPM intake
Holley 770 cfm Street Avenger
MSD billet dist w/MSD-6A box
Heddman Headers 1 3/4" ceramic tubes
Flowmaster American Thunder 2 1/2" with crossover
Edelbrock Alum heads, 290 intake ports, 110 comb chamber
2.19 intake and 1.88 exhaust
Voodoo 268/276
Duration @ .50 IN/EX: 227/233
Gross Valve Lift IN/EX: 542/554
LSA/ICL: 110/106
Range: 1800-6200

Running thru a M21 and 3.55 12 bolt.

Hopefully the snow will be melted before car is street ready !!!

770's come with 72/75 out of the box. Should be pretty close for your combo, but I susepct you will need more. If it feels a little soft on top, keep going up on the rears. I'm at 72/84 and I think I still need more in the back. I tried all the springs and the silver (stock) seemed the best.

Set your distributor for about 36* total. Try and get as much initial as you can (use the small bushing) w/that big cam.

Sounds like your gonna have a real runner there!

OK ... I'll admit I'm green when it comes to the MSD. What do you mean when you say 36* total and what is the small bushing ??

Sounds like 72 minimum in the primaries and at the least 78 to 80 in the rear. What does it hurt to go a bit bigger in the secondaries. If you're pulling them in how much is to much ??

OK ... I'll admit I'm green when it comes to the MSD. What do you mean when you say 36* total and what is the small bushing ??
??

An engine makes it's best power with it's wot advance at a certain point. In most cases that is at about 36º. If max accelleration is the goal, you want to make as much power as you can as soon as you can. Lot's of variables involved (like vehicle weight, gearing, octane, etc.) which will limit just how soon you can bring it all in. The bushings determine how much centrifugal (the amount of timing the distributor adds over initial) the dstributor adds and the springs determine how fast that advance is added. To see where to set your total, be sure to rev the engine until the timing marks stop advancing.