Motor will be a wedge head with the bore and stroke previously stated. Rod journel will be the 2.200 size as I've heard this will work in a standard cam location block (steel rods btw) I guess my original question would have been more to the point if I'd asked if going from 572ci to 604 was worth it. However I'll be upgrading the heads (would like a best machine cnc port and Ti intake valve). Change rocker ratio (1.6 to 1.7) also and maybe go to a tunnel ram. Thanks. 
'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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