47-59 Jag IRS/4 link, c-notch, raised bed floor woes! Help please!

[nikwho]

Hey all,
I've been neglecting my bed floor, due to uncertainty regarding the path that I want to take with my rear suspension. Not knowing what path to take with the bed floor is holding me up from getting my truck painted.

I typically just give myself some time, to process this type of stuff, as the answer typically comes to me... However, I've been stumped on this for about the past year or two! The truck is pretty dialed mechanically, otherwise. The weak link is certainly in the rear suspension. I need to address it. I have a few questions.

My buddy has a Jaguar IRS that he will sell me. I've been interested in an IRS swap for a long time. The truck has a '79 Camaro sub-frame, QA1 tubular control arms, Hotchkis dual rate springs, Bilstein shocks and a fat front sway bar.

Currently my truck has the factory rear leafs. I pulled a couple of springs from the leaf pack years ago, to soften the ride. Has a 10 bolt rear axle. I have everything ready to rebuild and re-gear it. I'm torn between running the No Limit Fat Bar four link kit, or doing the Jag IRS swap. My frame is currently c-notched four inches, protruding just above the bed floor level.

My current ride height puts my rear axle right about at the plane of the bottom of the frame rail. I like the idea of the Jag IRS swap, but don't want to increase ride height. I don't want to complete my bed floor before knowing what I'm going to do.

Thoughts? Issues with JAG IRS? How much power can they handle? How do they actually handle? This is a 420 HP 383, TH350, but plan to swap to a T-56, or Richmond 5 speed in the next couple of years!