Just an observation on what each head you may consider will do. The 440-1, then 572-13, then B1, and finally the B1Mc.
The performance level goes up close to the same as you move up to each head. Although I think the 572-13 isn't too far behind the B1, The 440-1 will make about 850 on most builds, 572 another 50 hp, and so on. The B1mc has shown itself to make over 1050 with the right parts. So its a matter of cost Vs dollars, or if you really like on head style over the other, and you seem to want to stay with the Indys, fine. The 572 has different valve angles, 13 vs 15, and moved valve location which requires a different piston. I don't know if it is possible to cut the new notches in your old pistons, but may be worth investigating. The Rocker assembly's are different if you run Jesel. If the bars that bolt to the heads are the same, you may be able to purchase just part of the setup (exhaust rockers?) and save some $$.