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On a side note, the vast majority of cams that Indy Cylinder Head supplies / recommends are split pattern. Whilst these guys may not be the easiest to speak to over the phone, I'd bet they've used some dyno time trying different types of cams and maybe found whats best for Indy heads. Sorta tells me something  
Hi Tig , maybe you can ask Indy the reason for going split with their heads next time you speak to them , my bet is they don't know. 
As long as they know from results that they worked best for those heads then that will do for me
FWIW this cam 320 / 320, 288 / 288 @ .050 .691 when installed 4 degrees retarded (@ 112) from the recommended 108 picked up 2 tenths. We were just looking for a little more top end and it worked but what was that telling us?
'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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