ARP part numbers?

[Sonny//414\\]

OK, So now the guy who's supposed to sell me his 328is doesn't want to see his car used for parts (I guess I shouldn't have told him I was going to use the drivetrain and junk the rest)...So it looks like I may have to do it piece by piece.

First I need ARP numbers for the 4cylinder thats in it, and then I'll need (maybe) the right ones for the M50 that I plan on getting from a salvage yard to rebuild. At least I'll know it's all new inside and out.

I'm seeing 201-4601 for 318's but is that the old or new? M40 or M44???
And I guess 201-4302 for all M50's and S50's/S52's?

Any help, is as always GREATLY APPRECIATED.