JJ,
Cams are another area where everyone has their opinion, and of course has their preference. Some like it lopey, some like it smooth w/ a hint that it isn't stock, etc. The general consensus is that you'll have to run at least an advertised duration of over 280 degrees, .480" lift, and around 226-230 degrees duration @.050 to make around 375-400 hp- this is provided your whole package is matched to use this cam. Cams with a tighter lobe separation angle, like the 110 LSA Comp cams, work slightly different- because they tend to make power sooner their power curve also tends to drop off at higher rpms as opposed to 112-114 LSA cams. In any case, consult your builder and ask what he recommends with the parts you are running.
I typically only pull the engine alone, since I usually am only working on that and don't need the extra work of dealing with the larger mass of an engine/ trans assembly, as well as having to find a place for a trans in my crowded garage. I will only pull both engine and trans if the trans is a stick- much easier to install a clutch and pressure plate with the engine on the floor out in the open. The heads on an engine have enough bolt holes on the front and back for you to attach a chain to it- should be a straighforward operation if you take care and make sure everything is unbolted from the engine.
Geno