Where to Get a good rebuilt 390 and what would be good mods for a daily driver?
I can't offer any advice on that company or their rebuilds but I can on the engine... or at least try.
I couldn't find any information on what size valves the heads come with?
Since it's going to be primarily a daily driver the 255DEH cam seems like a good choice. If not that then you should go with the 268H as that one seems to be pretty popular. The intake, cam and exhaust are going to let your FE breathe a lot, and that's what those engines really need.
Just my two cents on your question. You should try asking on the Ford FE forum just to see what some of them have to say too. www.FordFE.com
-2004 Ford Ranger Edge / 4.0L 5-speed Auto
-1963 1/2 Ford Galaxie 500XL / 390 Tri-Power C6