I recently decided to put together a sbc I had laying around. I used a lightly used crate short block and put 2.02 heads on it. Cant get it to run and I am getting the loudest backfires I have ever heard! Ive checked my ignition timing and firing order on my hei distributor numerous times and they are correct. I know im not 180 off because I found tdc with the valve cover off and verified I was on the compression stroke with my finger in the plug hole. Ive checked compression and they are at 150 in all cylinders. When I take the carb off I noticed there was a lot of standing fuel in the intake. Swaped my Holley for a Edelbrock off a running vehicle and I still have the same problem. I am going crazy over here Can someone please help me??