I used the Mancini kit for my 416. It is a high quality kit that uses a Callies crank. I got the one that was already balanced. I also have Eddy heads that were ported by RyanJ at Shady Dell speedshop. It's agreat combo that's hard to beat. I have a small solid street roller and 11.5-1 compression and my motor made about 540 HP with a Perf RPM Airgap/950 Holley and just under 500 with a six pak. -Bob
