Re: 427 Big Block Truck Motors
As said, intake, distributor and header fitment issues are the main concern's, otherwise it should bore out an 1/8th" over and you can then stroke them out to about 550" if you grind the lower end. IF you want a cheaper, big motor.
To me tho, I'd find an old mid '70's to mid '80's P/U 454 core motor and build a 460/468/489/496 motor..
And I have a 496 in my car now.
If I was to ever build another one, I would buy a Merlin Pro block or whatever one is on sale that will bore to 4.625" and then install a 4.375" crank and make a standard deck height 588" motor!! For STEALTH, He, He!!!! (Probably looking at 700hp with a big solid cam!!).....
The guys in the know would know it's not a 396, but I figure my big headed other B-i-L won't know the difference!!