The 402 really didn't enter into the conversation but since someone mentioned it, it was not really a plan D relative to the 360-380/390. It was sold at the same time the 390 was available.

There is a new low cost 4" stroke, reman-style, magnum head MP crate engine hopefully coming online this summer. I'm not going to post the part number until it's been activated, however the directional MSRP is currently $5419 so that's a good sign. Given the pieces in it, it should run as hard (or better) than the older version.

On the intake....for a 3.58 stroke combination using a dual plane instead of a single plane really isn't a huge handicap, depending on the car. Usually the dual plane will outrun the single plane on a street oriented 3.55 gear, 2400 stall type of car.