Been looking at low end sticks for my 68 383 powered Fury in the stock 256 up to 284 durations and have had a play with the dyno 2003 software (similar to camquest)

One of my discoveries is that mopar heads exhaust to intake ratio's suck, they are nowhere near the "magic" 80% figure, some of the newer ones come close (the trickflows are almost spot on) but the flow figures on stock and ported stock heads are usually 70-75%.

As I am stuck with my 906's with cleaned up ports for the foreseeable future, a dual pattern camshaft makes sense to "fix" the flow differences.

Currently the 268/280 or 255/275 grinds look not too bad for my purposes but of course as I have the dyno software I have been playing and have come up with this:
Duration 252/284 lift.462/.484 ICA 109.8 LCA 111.9 ECA 114 Overlap 44.3
It swaps a few HP from 5k to 2k vs the 268 cam, has the torque figures of the 255 cam and has better VE figures than either, all this is computer output though.

So is this a viable camshaft with 32 degrees of exhaust duration more than the intake? If not, Why?