All the 400 / 383 discussion has made me dizzy. I came across what I think was a good deal on a 383 rotating assembly so I bought it. This is what I got for $669 including freight:

New cast steel crankshaft (unknown mfr)
Scat 4340 I Beam 5.7" rods 31CR5700P
190,000 psi rod bolts
Speed pro HE pistons H860CP
Sealed power cast rings
Clevite bearings
Fitted and balanced
Cam clearancing on rods

This is going in a '65 Studebaker Commander. I'm looking for 350-400hp and run on street gas.

What head size and runner size should I use?
Not looking to run high rpms (below 6k), probably want more low end that high end.

I've seen a set of Dart Iron Eagle SS heads with 67cc / 170cc runners / 2.02/1.6 valves at Performance Auto for $639 plus shipping.

What say you all??