IRS General Questions - 68 Camaro

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So I searched and didn't see many people running this setup - most seem to stay with the live rear and run a link setup if going away from leafs. Is there a reason for this? Speaking for a street car that might see some road track time - coming from a guy who has road course experience in purpose built track cars. I'm really wanting the handling of say my M3 track car in this Camaro, but hey aren't we all?

To run the Heidts IRS it says it's bolt on, now I saw one guy doing it and he did a mini tub - is that needed? Must you do some version of a tub to run a good IRS setup? What about the Fast Track Roadster Shop IRS setup? This one does not appear to be bolt in and requires more customization and welding. With the width tires and rims they say this will run I'm assuming body modifications are required to accomplish this?

Any other solid IRS setups out there? Any reasons to pick one vs the other? One is bolt on but is the other worth the extra effort/time/money to weld it in? Keep in mind I'll be doing a front end as well, both of the aforementioned companies have 'matching' front ends also. I'd like to keep it all the same company unless 1 makes a better setup for one end then the other does.

Thought I had decided on the Heidts Kit but can't find a lot of information on the forums out there from individuals who are actually running it.

Thanks!!