the 460 is a great saw as well . it would be a lot like doing s 440 up with AM parts. your probably going to have to use OEM tank , covers and so on.
the good news is i think more OEM covers and the like are around for the 460.
i don't know if there is a AM crankshaft for a 460?? it would be a real straight forward build --just like the 440 just a little bigger. everything else you can get flywheels, coils, carbs and quite a bit of stuff interchanges with the 440 so AM 440 stuff can be used in some places. i don't think i have seen a 460 shortblock on evil-bay yet --but honestly i haven't looked--
i have worked on the top end on my 372xp some so i ain't completely lost on building one out of parts--but i don't want to strip the one i got to finish the build or to see how it fits. i am mostly a stihl guy -- though i do have a 372xp and recently bought a echo timberwolf.
if i get a unresolved problem i just look the parts up on the internet --most places have a schematic that shows how things fit if i get "lost".
i probably should buy the OEM shop manual for the 372xp -- the DVD version is like $10 on flea-bay--
i suppose it depends on how much work you want to do -- a 372 is a bit cheaper to build , the downside is it is more time consuming than a 460/440
i just want a 372xp china doll to go with my ms440 china doll-- and i want to see if it runs like this 440--