i have a 2 toyota ct-26's...I had 3 but sold one off....they aren't that hard to get
Any rev limiter/launch control will build boost. Problem is you need to find one that will play with timing so it will only build a certain amount or it will just have full boost on launch and that will be tough to control. i've never used either of the products you are talking about, so i don't know their features.
btw a low 12 or high 11 second car will not be that hard to build. I ran 12.3 @ 118 with my mild KA-T with no launch control or drag radials, spinning to a 2.05- 60' ft time. You should have no problem with a lightly modded RB25
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