What About Edelbrock 340 Heads?

OP, be sure you get the Edelbrocks you want. The '340' version are essentially an 'open' style chamber, with a 4+" round recess milled in them. They can be used with the stock 340 pistons and block where the pistons tops protrude approx .018" with any thickness of head gaskets. But you can't achieve a quench gap with them and the stock type pistons.

The 'regular' Eddie heads have a closed chamber, but if you have a the protruding 340 stock type pistons, you need a thicker head gasket. Something in the range of .055" will do nicely and you will have a nice quench gap.

My son and I are very happy with the ones we put on his 'cuda. It is a street only machine, and we just had the below-the-seat area opened up a bit and smoothed on a Serdi machine. Otherwise, OOTB, easy HP up to the high 300's or around 400-ish range, which is where we wanted to be. And less worries over detonation with the cooler AL than with iron if you want to push the DCR levels up for low end torque.