Save yourself the headache and block clearancing and build an awesome little 406 with a 3.75 crank and go woth 6" rods trust me will be all you will want to handle if you can hook it up! ecs mated with a good set of heads 215cc would be just right, this is the exact combo im building for my prostreet keep your cam under 270 ish @.050 with a good single plane and you will A. save your self the price and headache of clearancing your motor and B. will most likely out perform the set up you mentioned beacause increasing the bore to 4.0 will indead at torque but like mentoned not with out problems with cam clearnace etc
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