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this is probably a question for seasoned mopar nuts or machinist thats been around awhile.some yrs. ago i was going to start a project on a 1970 swept line camper special dodge pick-up 3/4 ton sraight axle.i had a 360 to build and decided i needed a bigger engine and bought a 413 out of a 1971 superior motorhome.the old guy i got it from wanted a little more power and bought a 440.anyway,i read in the mopar performance book 8 th edition that you can safely bore the r/b big blocks .060".since it shares the same block with the 426,can it be bored to 4.24 or 4.31 asumming that the bore was the stock 4.18 to begin with.the block # is 2658836 industrial with a steel crank and the date code is 7-14-70.some of the different parts come back as wedge and 440 six pack parts.the only 426 block being made at that time was the dual 4 hemi.i was wondering if thats the block that they start with also.