i've put a new top end on my 350f, new pistons, rings, etc. i put on a head i got off of ebay, took .010'' off of the head, cleaned up good. lapped in the valves, put all valves and springs etc. back in the same places. i did some minor port work on the intake and exhaust ports, mostly grinding off some of the rough casting spots and rounding off the bottom edge where it turns into and out of the cylinders. i put in new points and condensers timed it to stock. they are spot on. now when it runs it will not idle at all. any thing below 2,000 rpm it dies like you turned off the key. it has a little miss or popping out no. 1 exhaust, like maybe the valve is not seating right. it pops once about every 4 or 5 seconds. it acts like it wants to ldle better when its cold. no. 1 plug looks to be a dark dry sort of black which seems to me to be the idle settings are i little off or ignition. the other plugs look good. i changed the coil that feeds no. 1 cylinder but it's still there. i've had the carbs off to check the ldle circut about 7 or 8 times this year. i'm getting way to good at that. my brother inlaw says it is too lean at idle, but when i put in richer jets it is worse. i tried messing with the air screws but not much happens. i checked for an air leak at the intakes, they are okay. i have stock exhaust pipes on it but there are 8 holes drilled in the end of each one. i wonder if i am looking at more than one problem i guess thats about it any thoughts?? thank you.