I have a 327 with a 270 Magnum Comp Cam 2.02 heads hi rise performer RPM intake manifold and 750 edelbrock carb which I know is too big and called them and I have leaned out jets rods etc to make it work great. Anyways, there is not that much room under the hood so I had a pretty short air cleaner on it but the engine was running super powerful. I've had this engine for 27 years and this is by far the fastest it's ever been. My friend suggested getting a low rise plenum hooked up to a 4 inch stainless tube to the cone air cleaner right behind the headlight. So it basically made everything worse. Stumbling. Engine cuts out at 5000 rpm. Kind of misfires from 4000-5000 etc. Thinking that the air flow was super increased making it a lean situation I stepped up the carb jets and rods etc two steps rich. No change. Now I'm wondering if this thing is cutting my air intake and creating an over rich air flow. Since too lean or too rich cause the same problems. I put everything back to how it was and works great again. Has anyone had any experience with this? I bought this thing: https://www.summitracing.com/parts/spe-98499/overview/ All the reviews say great fit, looks great etc. One guy did claim he put that one on and the taller one on his 383 on a dyno and they both cut his power by 60 and 40 HP.