So, I just bought a 543...

Peak numbers for one pull were 716hp @5400 and 710tq (I forgot where that fell). That was without the spacer. With the spacer, we got 706hp @5700 and 701tq @5000. This was the better of the two power spreads by a long ways. It really wanted more fuel with the spacer, but unfortunately I didn’t have anything bigger for jets so that’s where it ended.