no need for high dollar stuff. What is the build? I'm running a 11.2:1 440-6 ported stage VI heads, 588 solid roller and I'm using the stock carbs. I have zero issues with the set-up. What is your initial? When do you have you advance in? I have 36* all in it 2000rpm. No vac advance if you have anything but stock to mild build and if you spent the cash on those aftermarket blocks I'm guessing you have some go fast stuff. I run a 4.5PV, 70 main jets, 35 squirters and purple springs in the outboards. Go back to the basics. Unhook the outboards and set the primary for best vaccum, run the idle up to 2300 and see where your timing is. I'd set it in full at 36*-38* then hook up your outboards and back the idle down to 1000. Re-adjust for vacuum if needed.
P.S. I'm runing a stock MP distrib w/ Mr. Gasket springs and MP orange box.