Timing help!!

I need to put a good tune on my broken in 360.I have been searching the tech section and i have seen more good tune up tip's on here than anywhere else! I have never been able to quite get my timing right on. I took off my dist cap and bumped the motor until the rotor line's up with the no.1 exhaust manifold bolt.With that being done it make's my timing mark on the balancer line up with the zero mark on the atdc.Is that where it should be?I have the in dash vac gauge and it read's 3or 4 at idle with the vac advance disconnected and plugged off.My motor does'nt ping or run bad it's just hard to start and will backfire once when warming it up when it has'nt been run for a week or more.Once it warms up it runs pretty good no pinging or popping at all and it has lot's of power.It just smells rich and idles crummy. The motor is a machine shop rebuilt 1971 360 with ported out j-heads 202/160,9.5.1 hypertecic pistons bored 30 over,4-speed, ,489 sure grip with 276 gears (soon to be 323,355) 68/70 340 manifolds, eddy 750,mopar dual plane intake.MP elec dist.8mm wires blaster2 coil. Any suggestions?