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Another vote for the 4.5 bore x 4.250 stroke here.
Sounds good though

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If you already have the crankshaft you can have it offset ground down to the BB Chevy rod size and make the stroke 4.25 or even 4.300 like the one in my 518 low deck is I like the cam you chose, it sounds like the one in my 518 also My cam makes peak HP(with the six pak) at 5800 RPM and peak torque at 4500 RPM, it is a torque monster