The dished wheel is a rimblow as well, but it was used on the tilt-only wheel, and the flat rim blow wheel was used on the tilt & telescope columns.
Given that the heat stove outlet is positioned fairly high, you are probably correct about the manifold being an HP, but the standard 440s also had a the heat stove outlet in almost the same location (just a little lower). I wouldn't be satisfied as to which engine it had unless I saw the VIN and verified the engine number.
I need to correct my statement about the dished wheel on C bodies. All tilt only or all tilt & telescope steering columns used a flat rim blow steering wheel, and the deluxe dished wheel was only used on standard steering columns.
Thanks to ceebuddy for setting me straight.
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