My two cents worth...

Replace the oil filter adapter with the 427 service replacement part. These are still available through Ford dealers... or you can pay 5 times as much for the same part being auctioned on eBay. If you install a high volume oil pump you should also go with a higher capacity oil pan. IF you go with a HV pump, plan on installing oil restrictors in the rocker shaft feed holes in the heads. Some people just use Holley jets (size 80-90) as oil restrictors.

With an FE you might do better with a split duration camshaft. They (FE's) seem to like more duration on the exhaust side.

The factory cast iron headers flow a heck of a lot better than the log manifolds but can be expensive, even for the reproductions. Also, Sanderson makes shorty headers for the Galaxie.

For the intake you can go several ways. The factory aluminum police interceptor intake is popular along with the sidewinder intake. If you go with an Edelbrock, skip the performer and go straight to the performer rpm.

For the heads, get hardened exhaust seats installed. If you are adding adjustable rocker arms, buy the rockers, shafts and spacers as a complete kit. I have heard of incompatabilities between some of the manufacturers between the shaft OD and the rocker ID.