I have a '68 convertible with an EFI'd 408" Magnum that puts out a touch over 500 hp. It has a full US Cartool chassis stiffening kit in it including subframe connectors and a four point roll bar. I did have a triangulated Monte Carlo bar in it, but I had to remove it when I swapped out the Slant 6.
The chassis handles the power without any issues. It hooks up hard and launches straight. I'm sure not much would change with an extra 100 hp, but cars start to do strange things when the power passes that point and creeps up past the 700 hp mark. My other Mopar taught me that.
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