Does that rotating assembly include an Eagle crank? Every 4.25" stroke Eagle crank I've seen in a 400 block required clearance grinding of the block near the rear main corner of the block at a minimum, and possibly elsewhere. The pics of the crank show very close block clearances to the crank throws, are you sure that block was clearanced correctly? Engaging/disengaging the clutch pushes the crank axially, insufficient crank/block clearance? Rule of thumb a paper clip should fit between the block and crank throws at all close fits to demonstrate minimum rotating clearance.
Just an FYI, the last 4.25" stroker I did used a Molnar crank, which did not require any block clearancing. First time I've seen that.
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1964 Catalina 2+2 4sp, 421 Tri-power
1965 GTO, Roadster Shop chassis, 461, Old Faithful cam, KRE heads 305 CFM,
Holley EFI, DIS ignition.
1969 GTO 467, Edelbrock 325 CFM, Terminator EFI
1969 Firebird Convertible
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