ALERT!! SOUND THE ALARM!!..

gzig5 said
Sorry, didn't mean to confuse anyone.
Going on an stock-ish 340 street car. The cam and intake system can't make use of the extra flow that would be available at higher lifts from the big port/valve Shocker 185. So it doesn't make a lot of sense to spend $1000 bucks now for performance that will not manifest itself until a new motor is put together. Sorta like putting a set of TF or W2's on a 340/360 but not changing anything else, it should make more power, but there is going to be a lot more head than the engine can use.
The 171 version flows same or a little better than the Edelbrock heads and that will be a good improvement from the J-heads and still be balanced.

Whoever told you that was wrong. I can show you how wrong that is.

30 years ago heads like these weren't available. So look around. These heads are so big you can't use them. Today, guys are using heads on street cars that were unthinkable 30 years ago. Why? Because they were wrong back then too. You just couldn't get the stuff.

You can run a much better head, use a smaller cam and make more power everywhere.

Or, you can use a head that is low on flow, and then add more cam so it will RPM where you want it and it will be a weak suck down low and a pooch in the low middle.

A good head is worth every penny.