Those must be for a hemi or a minivan.
I remeber that they made some some kinda special for a 440 hemi, maybe even a one off factory experimental!
I wonder is they come in 2.5:1
Those adjustable rockers are from the super secret, solid cammed, 383-426 factory flexi-stroker B-engine. It was a 383 engine with a flex-able throw crankshaft that was 383ci at 817rpm idle and stretched out to 426ci by 6,254.7rpm.
