[DougD]

Tony Branda has the chrome pent-roof valve covers. They sell two styles - one with a hole for a breather and one without.

The original crank pulley is a single groove unit that is an integral part of the 427 balancer. You may be able to use a 390 pulley depending on what balancer you are using and whether you need additional grooves.

I bought my water pump pulley off ebay. Try to find one the same diameter or slightly smaller than your crank pulley.

Alternator pulleys can be used from any Ford alternator or you could use a larger diameter (but technically incorrect) hipo 289 pulley from most Mustang vendors - I'm pretty sure Branda sells these, too.

If originality is not important, many use March billet aluminum pulley sets.