M1, Victor340, and RPM Air Gap flow testing

The cam duration of 254 seems to be right on the boarder between a single and dual plane use. I’ve noticed this over the years. A bunch depends on the rest of the build and the cars weight and purpose. After reading your description, I’d use the RPM and follow Pittsburgracer’s advice with some home porting of the intake. Go up the runners ceiling and walls as far as you can and inside the plenum for a clean up. That’s all you can do and all that is really needed.

While the single plane may produce a few more top end ponies, the lack of low end torque is going to be a small but noticeable loss. It’s also the rest of the build. The carb, intake & converter seems right in there. The gears and probable weight of the car are not conducive for a single plane.

The build looks like it’ll do what you want it to do. Nice set up.