Need help with idle

[oldman]

I just finished our 306 and have a question about an idle problem I'm having. Keep in mind I only ran the engine this afternoon for about 20 seconds cause there's some other "thangs" I want to do before I try to line everything out tomorrow. THis may be self correcting but here goes. THe engine has a F303 cam in it and I expected a rough idle but the thing wouldn't idle at all without some foot pressure on the gas pedal. Actually I ran it several times for about 20-30 seconds each time so the timing isn't set spot-on but is there any tricks I might need to know now that will help? It smooths right out with a little pedal pressure but I'd hate to think this will be a reqirement for normal driving. On my youngest son's 82 ( cleveland powered), I drilled the throttle plates to help with the idle and this works wonders for that engine. Any ideas??