I used 440sources 438 kit before with good results, but now noticed That Mancinis 432 kit has a 4.15” crank vs the 440 sources 3.75” crank. We are pushing a 1969 RR with a 4 speed and 3.55 gears, who’s kit is going to make the most power for this heavy car?? Either way, we plan on using the stealth heads, headers, good ignition system, a voodoo .475-.495 lift Cam matched in rpm to a dual plane intake manifold good for about 1400-5800 rpm range. Thank you moparts!!!!