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I've never heard of a 450" 361 combo. What Crank are we talking about? Without knowing anything about the specifics, my first reaction is that it sounds like a an awful short piston, for a street motor. (???) I don't know that I'd feel good about going this route with a #'s correct block (???). A 3.75 stroke should get you into the 420" neighborhood (just off the top of my head), and would still be a reliable street motor.

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My formula was 4.155 bore,4.250 stroke,6.535 rods, with a compression height of 1.320.
Open to suggestions if you think that is not the best for a street motor.







4.250 stroke,6.535 rod,1.320 compression height.

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413 and 361 have the same stock bore, 4.180 I beleive Not 4.155