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Welcome to the forum. Sounds like the secondaries need adjusting, they are opening too soon and bogging, leaning out. Get yourself a vacuum secondary spring kit, contains about five or six different springs in it, all color coded. Start with the two heaviest, as in heavy in the rear vacuum canister and medium heavy in the front. The process is to slow down the secondaries from opening too fast and going lean (the bog), by swapping in the next lighter spring for the previous one until you start to bog once again, then go to the previous setup. So numbered one(heavy) through five (very light), start with 1 and 2, then go to one and three, then two and three, then two and four, then three and four. You will get to the point where they open according to the vacuum signal and not too soon, whcih is what you want. Let us know how it goes.
A second thing you will want to do, also, is slow down your vacuum advance springs, too. Big blocks don't like fast advance, so you should have a heavy spring and a medium spring in it, total advance of 38 degrees, too much will give you a little ping sometimes.
A second thing you will want to do, also, is slow down your vacuum advance springs, too. Big blocks don't like fast advance, so you should have a heavy spring and a medium spring in it, total advance of 38 degrees, too much will give you a little ping sometimes.