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I am installing a Ford 8.8 IRS in my scratch built CSX style chassis identical to the Kirkham chassis. It has required a substantial amount of fabrication of suspension pieces and mounting systems to make it all fit properly. I don't know how well it will work yet, since I don't have it on the road yet but I managed to stay fairly close to the original style suspension style and geometry.
A consideration also is that I don't know of any pin drive style hubs available yet for the 8.8 Ford rear end.
I imagine this isn't an option that Kirkham will be offering anytime soon as the Jag rear works so well in these cars as is. You aren't required to buy the rear differential from the Kirkhams, so a substantial savings may be had by shopping around for the proper Jag rear in used condition from a wrecked car of the proper year.
I believe also that most of the Kirkhams are set up for big blocks, so more fabrication will need to be made to accomodate a small block if you decide to go that route for money savings.
There are many good quality cars available for less money than the Kirkham that would be easier to accomodate your needs and your budget. You might try getting a ride in one or go to a gathering with several different Cobras in attendance and talk to the owners.
Just my 2 cent's worth- Bob
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