Im going to chim in here with my 2cents.
I don't see in any of the posts where you say what your currently timed at. Im assuming you installed the distributor yourself. The motor your running should be timed in the neighborhood of 10 - 14 degrees before top dead center, and get over 34 degrees of total advance at 3000 rpm. you need to get or find someone with a timing light at make sure your at or near these settings. you can pick up some degree tape at your local speed shop to put on your balancer to read the higher marks ar RPM....
The trouble you are having could also be carb related, and there are many adjustments to that carb to fine tune that trouble (but its sounds like the accelerator pumps are not squirting soon enough). Holley carbs are well known to require much adjustment out of the box. I would suggest a book on tuning Holley carbs, its well worth the cash.
Don't even bother with the spacers and springs in the distributor unless your sure its timed correct, and you have the wires in the proper firing order.
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