Hughes Edelbrock heads : Smallblock

Mike built me a 340 that makes 470 hp and 455 lb-ft and it used edebrocks with only a valve job (they were used), unless he did something I'm not aware of. 9.7:1 CR It's a REAL nice engine. Streetable as it was delivered, now totally amazing with port EFI. I have a full weight, full interior 4-speed car with 3.23's and you could drive this daily.

Hints: No stock rods, custom racetec pistons, hydraulic roller cam, beehive spring. Took a ton of weight out of the rotating assembly, which is what you need on a 340.

Based on actual experience - don't waste your time on porting. Have him build you a clone of my engine.
MRL Performance 340, WOW!