Worthwhile upgrade to Hughes rockers?

From the stockers that might be an effective 1.42 ratio to a TRUE 1.5 effective is a 5.6% increase in lift. From a stock lift of .420 (I think), your new effective lift would be .444..
If I already owned them, and there was no cost in the swap, like you, I would be very tempted to try it, but before I did, I would establish a repeatable base line run without tirespin, from say 3000 to 5000 in Second gear. Then repeat after the swap. I would do this on the primaries only, having defeated the secondaries, so as to stretch out the time.
That is what I would do...... because it only costs me time.
IF ....... there was a significant time decrease, I would reconnect the Secondaries, and leave the 1.5s in there. But if not, then I would swap the 1.42s back in and go get me a 2800TC. lol. Now yur talking....