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Holy Crap,I spent my hard earned $$$ buying not just 1 set but 2 sets of 572-13 heads,when I could have save $$$ by using 440-1 heads  I just let 1 set go with my spare engine,but you can bet the farm on this I won't be replacing them with a set of 440-1 heads. 
I would run another set of -13's anyday, It's not all about flow numbers.
You got that right. So lets start the list of 1000+ hp -13 motors out there I do know of one but it is a BIG motor...
It is your money spend it however you like but IMO there are better valuaes out there than the 572-13 head for the money. As for the OP seems the consensus is to save money and port what you have. If you want to upgrade I think most will agree DONT go to the -13. But we are all likely wrong 
When I can afford to upgrade I'll likely chose the B1 PSO's.
The -13's have a place, They don't have the complexity / valve train issues of the B1's.
If you are after max HP then the Hemi head is the choice.
Peace  
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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