TorqStorm® Slant 6 Supercharger Kit

My daily driver is a 66 Valiant MoreDoor with a hot-rodded slant six and floorspeed, and I have a 66 Barracuda with 6.1 based 426 gen3 hemi. I must say that I like driving the slant just as much as the hemi. They each have their perks.

That said, I'm very interested in this product. I want to build an AutoX racecar out of a 69 Valiant. One thing I'm learning in my growing experience is that horsepower is not a major advantage on the track, but weight (or lack thereof) is. My hemi car gets beat by Miatas and it's moderately prepared! I'm still weighing whether to build a hot 360 with aluminum head, intake, etc. or a super hot long-rod slant. The idea of a light potent slant is weighing heavily on me and this supercharger kit tickles my fancy. I wonder what kind of boost it can produce and what a slant could take, and at what compression.
Is a all iron slant any lighter than a aluminum head small block? I really don't know personally