I didn't know what the hell I was doing when I installed mine, so I bought the MP kit for my '62 Valiant. I remember having one hell of a hard time figuring out how to install it, even though it came with instructions. I also recall having to make about 4 trips to the local trailer parts supply...
I like the ThermoQuad, too, but if you decide to use one I think you'd be happier with a spread-bore manifold rather than trying to adapt a square-bore intake. I tried that with my 360, and it just didn't run very smooth. Poor fuel distribution compared to running a spread-bore. At cruise...
'62 Valiant V-200 4-door, 360 V8 with iron heads, old cast iron 727, Dana Power-Lock posi, Kelsey-Hayes disc/drums, 15 X 8" steel wheels, large front and rear sway bars, 1/4 tank of gas and driver: 3,180 lbs.