with the 1.12's i think i'd want something adjustable. fox or qa1 would be my choice.
if it hasn't been covered already, subframe connectors and frame stiffening is something that you should strongly consider.
yes, most all of that stuff will port right on over.
balancer (though the new motor should come with one) will not, and there's considerations on the timing cover depending if it's pre 70 and the crank pulley bolt pattern, but other than that you should be good to roll.
you'll need...
melling VS1298 are "stock" replacements, and melling notes that they are not suitable for their MTD-1 cam which specs out at 421/443
so at .450 you may wind up with an issue.
a quick math check says probably not, but i wouldn't go on that info without busting out the valve spring height...
look, i don't know what the situation is but homie seems to just want to go against the grain and get a little different with it, which is fine. i like different. different is cool.
but 360 crank in a 318 is just GOBS of money in machine work: cut the mains on the crank, skim down the...
360 main journals are bigger than 318, so you'll need to cut those down (and ideally heat treat the crank after, or not). you'll also need to trim some of the counterweights to clear the pistons-- which will need to be custom. though you can run stock low compression 318 pistons they'll wind up...