I would look at 5.7 inch SCAT or Eagle connecting rods and Speed-Pro pistons. The aftermarket rods are a lot stronger than stock rods and they have better bolts. Speed-Pro is a TRW product, and they are priced reasonably. They are heavier than the more pricey pistons like SRP, Wiseco, etc. Flat top pistons should give you the 11:1 compression ratio you are looking for. Those fuelie heads are going to restrict your power some as they do not flow enough air to let a hot 377 breathe well at high rpms. What are you planning to use this engine for? Street cruiser, occasional trip to the strip, or what?