Thanks for all of the help. For those who asked, carb is an Edelbrock 750 with elec choke. I pulled the valve covers and plugs and cranked the motor over by hand. All the rockers go up and down and none of the pushrods look bent (but I didn't remove them to check). The #2 and #7 plugs are a bit sooty and all others are clean. The plugs are new, as I thought that could be the problem. I guess from here, I need to do a leakdown test to see if I have a problem with the cam. Does it make sense to focus on the #2 and #7 cylinders? Also, I checked the gasket between the carb and the intake, and for some reason some of the material was missing on the inside of the cutout. Could this be the culprit?