I'll add my two cents worth. You can't just add a crossram and expect performance gains to your engine. As you can tell from some of the response here a lot of guys bolt them on because they look cool and are disappointed in their now poor performance. That's why Chevy ground a special cam for Penske and Donahue to use with their crossram. Chevy recomends you run a minimum of 12:1 compression with the crossram cam due to the overlap profile. You also need the correct gears to keep your vehicle in it's new power band, which is going to be above 4000 to 4500 rpm. Using 3.73 gears with a cross ram you probably won't be happy. Smokey Yunick said if you can get a crossram set up "PROPERLY" there is simply nothing that will run with it. He dedicated a lot of his time to the deveolpment of these manifolds. Problem is most people forget the properly part. They want the look and forget the rest of it. I've driven stock 302's and in my opinion these are not what most people consider good street motors today, but I love them. If they hook up below 4000 when you launch them not much happens. But if you hook up above 4500 to 5000 and keep pulling watch out! I'll never forget the look on this guys face when I lined up against him in my 302 69 Z and reved the motor to 5500, popped the clutch and mashed the throttle to the floor. That's what you did to get the 302 to pull, he was driving a 455 70 Firebird, so he was probably redlining where I had to leave the line! It broke his heart to hear he'd been beaten by a motor that had 1/3 less cubes than his. So think about what you really want. If you decide you want to run a crossram, go for the entire package and stick with a short stroke motor, I don't think a 350 is a good choice for the high rpm range these were designed for. Don't get sore about this, the 350 is a wonderful engine, just a little too much stroke for the high winding you'll need to see the benefits of the crossram. But I like high reving, rough idling, steep geared cars.