Robert,
If you were to go with a carburetor there are no manifold options, to my knowledge, that have a q-jet flange. Edelbrock offer both a single and a dual plane intake. GM Performance parts has a single plane intake available.
The MSD 6010 ignition box is not "active." It does not use any feedback from the knock sensors to retard the timing. It comes with 6 pre-programmed curves and it is also laptop programmable so you can set your own curve based on RPM and MAP.
If you already have a Muncie and don't want to move the shifter or change the length of the driveshaft, it will be critical for the bellhousing to be in the same location as before. The Edelbrock adapter plates will keep the bellhousing in the same location when used in conjunction with Chevrolet frame stands and motor mounts. You will also need to fabricate a bracket on the bellhousing for the z-bar pivot ball.
The stock truck pan is way too deep and hangs down below the crossmember too far. Your best bet is to use the Autokraft pan or modify an F-body ban. The A/C compressor will not fit in the stock truck location when used with the Edelbrock adapters. So unless you want to slide the engine forward, which I don't like doing, you will have to move the A/C compressor. There is a company that makes a nice bracket to mount a Sanden compressor, up high on the passenger side:
http://www.kwikperf.com/lsx_ac.html
Andrew